{"title":"Horstman MDC Clutch Parts","description":"\u003cp\u003eMDC is Horstman’s kart clutch family; this category covers its service parts, including 4-spring lever supports, stock black and modified red springs, clutch keys, #35 chain drums in 13–16 tooth sizes, and outboard mounting kits. Centrifugal clutches of this type use spring rate and shoe\/lever geometry so engagement speed rises as engine RPM increases, without a hand-operated clutch lever.\u003c\/p\u003e","products":[{"product_id":"3051-mdc444-g-l-jr-weight-lever-3051","title":"MDC444 G\/L Jr. Weight Lever for Junior Kart Clutch Tuning","description":"\u003cp\u003eLeverage every advantage in junior racing with the MDC444 G\/L Jr. Weight Lever. It facilitates precise centrifugal force application for balanced clutch action.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-Spring Matched:\u003c\/strong\u003e Ensures even pull distribution.\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003eLightweight Design:\u003c\/i\u003e Aids quick response.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSKU 3051 supports organized tuning sessions, allowing easy adjustments for track conditions. Delivers the consistency juniors need to build speed safely.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary function of the MDC444 G\/L Jr. Weight Lever?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This lever is designed to facilitate precise centrifugal force application within your Horstman clutch, ensuring balanced engagement and consistent power delivery for junior karting applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the lightweight design benefit my kart's performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The lightweight construction reduces rotating mass, which aids in quicker clutch response and allows for more sensitive tuning adjustments to match specific track conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is it important to use a 4-spring matched setup with these levers?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Using a matched 4-spring configuration ensures even pull distribution across the clutch assembly, which prevents uneven wear and provides the consistent, predictable engagement that junior drivers need to build speed safely.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use these levers for different track conditions?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the MDC444 levers are designed to support organized tuning sessions. By adjusting your weight configuration, you can fine-tune the clutch engagement point to better suit the grip levels and layout of different tracks.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4648-4-g-l-jr-mdc-4-spring-lever-support-4648-4\"\u003eG\/L Jr. MDC 4-Spring Lever Support for Advanced Kart Clutches\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/glbjr-g-l-basket-1-disc-glbjr\"\u003eGreased Lightning 1-Disc Basket for Junior Kart Clutches\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/glwlp-g-l-weight-lever-pin-glwlp\"\u003eGreased Lightning Weight Lever Pin for Kart Clutch Precision\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4648-g-l-lever-support-glls\"\u003eHorstman Greased Lightning Lever Support - Rigid Clutch Reinforcement - Open Class\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4650-black-spring-stock-4650\"\u003eStock Black Spring for Standard Horstman Kart Clutch Setup\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562576933182,"sku":"3051","price":3.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/mdc-3051-mdc444-g-l-jr-weight-lever-3051.jpg?v=1763112160"},{"product_id":"4649-red-spring-modified-4649","title":"Modified Red Spring for Horstman Kart Clutches","description":"\u003cp\u003eCustomization meets reliability in the Horstman Modified Red Spring. Tweaked for higher resistance, it accelerates clutch bite, ideal for tracks demanding instant response.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModified Tension:\u003c\/strong\u003e Provides sharper pull than stock for aggressive setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003eColor-Coded:\u003c\/i\u003e Red hue for easy identification in your kit.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe SKU 4649 helps organize your spares while delivering lap-time gains through precise power modulation. Pair with matching weights for a tailored curve that suits your style.\u003c\/p\u003e\u003cp\u003eRacers find it extends engagement range, reducing slip in high-power scenarios without sacrificing smoothness.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the Modified Red Spring differ from the stock black spring?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The Modified Red Spring offers higher resistance compared to the stock black spring. This creates a sharper, more aggressive clutch bite, which is ideal for tracks that require an instant response off the corner.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I mix and match these springs with other colors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e While you can experiment with different spring tensions to tailor your clutch engagement curve, it is generally recommended to use a uniform set of springs to ensure balanced engagement and prevent uneven wear on your clutch components.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: When should I replace my clutch springs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should inspect your springs regularly for signs of fatigue or loss of tension. If you notice your kart is slipping excessively or the engagement RPM has dropped significantly, it is likely time to replace your springs to maintain peak performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this spring compatible with all Horstman clutches?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This spring is designed for use with Horstman clutch systems. Always ensure your specific clutch model supports the use of modified tension springs and pair them with the appropriate weight levers for your setup.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4650-black-spring-stock-4650\"\u003eStock Black Spring for Standard Horstman Kart Clutch Setup\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcwl-reaper-weight-lever-rcwl\"\u003eReaper Weight Lever - Tunable Horstman Clutch Element\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/3051-mdc444-g-l-jr-weight-lever-3051\"\u003eMDC444 G\/L Jr. Weight Lever for Junior Kart Clutch Tuning\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcpp-reaper-pressure-plate-rcpp\"\u003eReaper Pressure Plate - Dynamic Horstman Clutch Controller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4648-mdc-6-spring-weight-lever-support-plate-4648\"\u003eMDC 6-Spring Weight Lever Support Plate for High-Performance Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562583126334,"sku":"4649","price":9.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/greasedlightning-4649-red-spring-modified-4649.jpg?v=1763112277"},{"product_id":"4650-black-spring-stock-4650","title":"Stock Black Spring for Standard Horstman Kart Clutch Setup","description":"Reliability in every coil— the Horstman Stock Black Spring sets the standard for clutch consistency. Its factory-spec tension supports smooth, predictable operation across various conditions.\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eStandard Rate:\u003c\/b\u003e Matches OEM requirements for hassle-free installs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eBlack Finish:\u003c\/em\u003e Corrosion-resistant for longevity.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eUsing SKU 4650 keeps your setup organized and true-to-form, minimizing variables during tuning. It's the foundation for building speed without overcomplicating things.\u003c\/p\u003e\u003cp\u003ePerfect for maintenance, it restores factory feel, aiding steady acceleration and control on familiar tracks.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my Horstman clutch springs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Clutch springs lose tension over time due to heat cycles and mechanical stress. It is recommended to replace them as part of your routine maintenance schedule or whenever you notice inconsistent engagement or a drop in engine RPM performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I mix the black stock springs with other colored springs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is highly recommended to use a matching set of springs across your clutch assembly. Mixing spring rates can cause uneven pressure on the pressure plate, leading to erratic engagement and potential damage to your clutch components.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the 4650 black spring compatible with all Horstman clutches?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This spring is designed for standard Horstman clutch setups. Always verify your specific clutch model and manual requirements to ensure the spring rate matches your intended application and tuning needs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the benefit of using factory-spec springs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Using factory-spec springs ensures predictable, smooth engagement. It eliminates guesswork during your tuning process, allowing you to maintain a consistent baseline for your kart's acceleration and power transfer.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4649-red-spring-modified-4649\"\u003eModified Red Spring for Horstman Kart Clutches\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcpp-reaper-pressure-plate-rcpp\"\u003eReaper Pressure Plate - Dynamic Horstman Clutch Controller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4648-mdc-6-spring-weight-lever-support-plate-4648\"\u003eMDC 6-Spring Weight Lever Support Plate for High-Performance Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4648-4-g-l-jr-mdc-4-spring-lever-support-4648-4\"\u003eG\/L Jr. MDC 4-Spring Lever Support for Advanced Kart Clutches\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4651-horstman-clutch-key-4651\"\u003eHorstman Clutch Key for Secure Kart Driveline Locking\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562583191870,"sku":"4650","price":9.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/greasedlightning-4650-black-spring-stock-4650.jpg?v=1763112278"},{"product_id":"4651-horstman-clutch-key-4651","title":"Horstman Clutch Key for Secure Kart Driveline Locking","description":"\u003cp\u003eNo slip, all grip: the Horstman Clutch Key is the unsung hero of secure power transmission. It wedges firmly to keep components synchronized during aggressive runs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Fit:\u003c\/strong\u003e Matches shaft specs for zero play.\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003eDurable Material:\u003c\/i\u003e Resists shearing under load.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSKU 4651 simplifies assembly, keeping your driveline organized and race-ready. Essential for avoiding power loss that costs positions.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is the clutch key essential for my kart's driveline?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The clutch key acts as the critical locking mechanism between your crankshaft and the clutch hub. Without a secure, precision-fit key, you risk slippage, power loss, and potential damage to the keyway on your crankshaft.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if my clutch key needs to be replaced?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should inspect the key whenever you remove the clutch for maintenance. If you notice any signs of shearing, deformation, or \"rounding\" of the edges, it must be replaced immediately to ensure safe and efficient power transmission.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this key compatible with all Horstman clutches?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This key is designed for standard Horstman driveline applications. Always ensure your crankshaft keyway is clean and free of debris before installation to ensure the precision fit required for zero-play operation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Any tips for installing the Horstman Clutch Key?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Ensure the key is seated fully into the crankshaft keyway before sliding the drive hub over it. If the fit is extremely tight, use a light coating of anti-seize or assembly lube to prevent galling, but ensure the key remains firmly in place during the final tightening of the clutch bolt.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcdh-reaper-drive-hub-rcdh\"\u003eReaper Drive Hub - High-Performance Horstman Clutch Core\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4638-splined-drive-hub-4638\"\u003eHorstman Splined Drive Hub for Seamless Kart Power Connection\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/hcb-clutch-mounting-kit-hcb\"\u003eHorstman Clutch Mounting Kit with Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcbk-reaper-bolt-kit-rcbk\"\u003eReaper Bolt Kit for Horstman Clutch Assembly\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rccw-reaper-crank-washer-rccw\"\u003eReaper Crank Washer for Optimal Horstman Clutch Alignment\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562622972222,"sku":"4651","price":2.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/greasedlightning-4651-horstman-clutch-key-4651.jpg?v=1773751805"},{"product_id":"4656-outboard-mounting-kit-4656","title":"Horstman 4656 Outboard Mounting Kit - Vibration Dampening - Open Class","description":"\u003cp\u003eSecuring your drivetrain for high-stakes racing demands hardware that won't flinch under peak RPMs. The Horstman 4656 Outboard Mounting Kit is engineered to streamline external clutch installation, providing a rigid, vibration-resistant hold that keeps your power delivery consistent from the green flag to the checkered. Whether you are tuning high-output go kart transmissions or dialing in your chassis setup, this kit delivers the rock-solid alignment required for flawless acceleration and reduced component wear.\u003c\/p\u003e\u003ch2\u003ePrecision Alignment for Go Kart Transmissions\u003c\/h2\u003e\u003cp\u003eIn the pit, efficiency is everything. When you are thrashing to swap brake discs or organizing your tools tire changing equipment, you need clutch installation to be fast and bulletproof. The Horstman 4656 kit eliminates the guesswork of outboard mounting. By dampening harmonic vibrations and ensuring perfect concentricity, this hardware prevents premature wear on your clutch drum and crankshaft. It is the professional's choice for maintaining optimal chain tension and maximizing drivetrain longevity under severe track conditions.\u003c\/p\u003e\u003ch2\u003eEngineered for Unrelenting Durability\u003c\/h2\u003e\u003cp\u003eBuilt for the rigors of competitive motorsport, this mounting kit provides the structural integrity needed to handle aggressive launches and heavy braking zones. A misaligned clutch robs horsepower and destroys chains; the Horstman outboard kit guarantees that your rotational mass stays perfectly balanced.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Hardware Set:\u003c\/strong\u003e Includes all necessary bolts, spacers, and brackets for an immediate, hassle-free outboard assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration Dampening Technology:\u003c\/strong\u003e Significantly reduces harmonic noise and mechanical wear across your drivetrain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Horstman Fit:\u003c\/strong\u003e Seamlessly integrates with various Horstman clutch models for versatile application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRapid Pit Installation:\u003c\/strong\u003e Enhances pit efficiency, allowing for lightning-fast mounts and dismounts during critical repairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Power Delivery:\u003c\/strong\u003e Maintains perfect alignment to ensure smoother, more confident acceleration out of corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Construction:\u003c\/strong\u003e Machined from high-tensile materials to withstand the extreme torsional loads of competitive karting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Builder's Choice:\u003c\/strong\u003e A proven time-saver during complete chassis builds, ensuring your driveline is race-ready.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDon't let a compromised clutch mount cost you a podium finish. Upgrade to the Horstman 4656 Outboard Mounting Kit and experience the reliability that professional mechanics trust.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is an outboard mounting kit necessary for my kart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e An outboard mounting kit ensures your clutch is perfectly aligned with the crankshaft. Proper alignment prevents premature wear on your clutch drum and crankshaft, reduces harmonic vibrations, and ensures consistent power delivery to the rear axle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this kit work with all Horstman clutch models?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The Horstman 4656 is designed for universal integration with various Horstman clutch models. It is specifically engineered to provide a rigid, vibration-resistant hold for high-output racing transmissions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this kit include all the hardware needed for installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the 4656 kit is a complete hardware set. It includes all necessary bolts, spacers, and brackets required for a rapid, hassle-free outboard assembly in the pits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does this kit improve my pit efficiency?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By streamlining the mounting process, this kit allows for faster clutch swaps and adjustments. It eliminates the guesswork of alignment, meaning you spend less time wrenching and more time on the track.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this kit handle the stress of competitive racing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Absolutely. It is machined from high-tensile materials specifically to withstand the extreme torsional loads, aggressive launches, and heavy braking zones found in competitive karting.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcsp-reaper-clutch-spacer-rcsp\"\u003eReaper Clutch Spacer for Precise Horstman Alignment\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rccw-reaper-crank-washer-rccw\"\u003eReaper Crank Washer for Optimal Horstman Clutch Alignment\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcbk-reaper-bolt-kit-rcbk\"\u003eReaper Bolt Kit for Horstman Clutch Assembly\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4651-horstman-clutch-key-4651\"\u003eHorstman Clutch Key for Secure Kart Driveline Locking\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/hcb-clutch-mounting-kit-hcb\"\u003eHorstman Clutch Mounting Kit with Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562629099838,"sku":"4656","price":19.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/greasedlightning-4656-outboard-mounting-kit-4656.jpg?v=1763113185"},{"product_id":"3129-backplate-hub-screw-3129","title":"Horstman Clutch Backplate Hub Screw for Secure Kart Assembly","description":"\u003cp\u003eSmall parts make big differences— the Horstman clutch backplate hub screw (SKU 3129) is proof. This precision fastener locks your backplate and hub firmly, eliminating play that could lead to power loss or failures mid-race.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-Resistant:\u003c\/strong\u003e Built to last through sweat, dirt, and track elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003eEasy Threading:\u003c\/i\u003e Fits standard Horstman assemblies without tools slipping.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIdeal for racers who value organized, no-fuss repairs, it helps maintain clutch integrity for faster, safer laps.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is it important to use a specific Horstman backplate hub screw instead of a standard hardware store bolt?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Horstman clutch hardware is engineered to specific tolerances and material strengths required for high-RPM karting environments. Using the correct 3129 screw ensures proper thread engagement and vibration resistance, preventing the hub from loosening or causing catastrophic clutch failure during a race.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I inspect my clutch backplate hub screws?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should check your clutch hardware before every race day. Inspect for any signs of backing out, thread wear, or corrosion. If the screw shows signs of fatigue or if you have recently serviced the clutch hub, it is best practice to replace it to ensure a secure assembly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need to use thread locker when installing this screw?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e While the screw is designed for a secure fit, many racers choose to use a small amount of medium-strength (blue) thread locker as an extra precaution against the intense vibrations found in karting. Always ensure the threads are clean and free of oil before application.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this screw fit all Horstman clutch models?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This screw is designed for standard Horstman assemblies. Please verify your specific clutch model (such as the Reaper or MDC series) to ensure compatibility, as different clutch configurations may utilize specific hardware lengths or thread pitches.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcdh-reaper-drive-hub-rcdh\"\u003eReaper Drive Hub - High-Performance Horstman Clutch Core\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4638-splined-drive-hub-4638\"\u003eHorstman Splined Drive Hub for Seamless Kart Power Connection\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcbk-reaper-bolt-kit-rcbk\"\u003eReaper Bolt Kit for Horstman Clutch Assembly\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcdps-reaper-drive-plate-screw-rcdps\"\u003eReaper Drive Plate Screw - Secure Horstman Clutch Fastening\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/hcb-clutch-mounting-kit-hcb\"\u003eHorstman Clutch Mounting Kit with Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562629689662,"sku":"3129","price":18.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/greasedlightning-3129-backplate-hub-screw-3129.jpg?v=1763113200"},{"product_id":"4648-4-g-l-jr-mdc-4-spring-lever-support-4648-4","title":"G\/L Jr. MDC 4-Spring Lever Support for Advanced Kart Clutches","description":"Elevate junior kart performance with engineering finesse. The G\/L Jr. MDC 4-Spring Lever Support anchors your clutch levers securely, distributing spring force evenly to avoid binding or uneven wear.\u003cp\u003eStandout attributes include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFour-spring compatibility for tunable engagement profiles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinforced Build:\u003c\/strong\u003e Endures the demands of young racers' aggressive styles.\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003ePrecise Engineering:\u003c\/i\u003e Ensures levers move freely yet stably.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eOn the circuit, the SKU 4648-4 delivers consistent power delivery, helping juniors master starts and maintain speed through turns. It streamlines trackside organization by simplifying spring swaps, keeping sessions productive.\u003c\/p\u003e\u003cp\u003eFor parents and coaches, this support means fewer mechanical issues, allowing focus on skill development. It fits seamlessly into Horstman Greased Lightning Jr. setups, enhancing overall driveline harmony.\u003c\/p\u003e\u003cp\u003eDelve into its design: the plate's geometry minimizes leverage loss, boosting efficiency in low-to-mid RPM ranges. This makes it perfect for developmental classes, where building confidence through reliable machinery is crucial. Invest in this for a kart that grows with the driver.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the G\/L Jr. MDC 4-Spring Lever Support compatible with all Horstman clutches?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This specific support is designed for the Horstman Greased Lightning (G\/L) Jr. MDC setups. It is optimized for 4-spring configurations to ensure proper engagement and driveline harmony.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does this lever support improve my junior racer's performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By anchoring the clutch levers securely, it distributes spring force evenly. This prevents binding and uneven wear, resulting in more consistent power delivery, smoother starts, and better speed maintenance through corners.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this part require special tools for installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e While standard karting tools are typically sufficient, we recommend ensuring your clutch assembly is clean and free of debris before installation. This support simplifies spring swaps, making trackside maintenance more efficient.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this with a 6-spring setup?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No, this component is specifically engineered for 4-spring compatibility. For 6-spring configurations, please use the appropriate MDC 6-spring support plate.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I inspect the lever support for wear?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e We recommend inspecting the support plate during every routine clutch service. Look for signs of uneven wear or deformation to ensure the levers continue to move freely and stably.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/glbjr-g-l-basket-1-disc-glbjr\"\u003eGreased Lightning 1-Disc Basket for Junior Kart Clutches\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/3051-mdc444-g-l-jr-weight-lever-3051\"\u003eMDC444 G\/L Jr. Weight Lever for Junior Kart Clutch Tuning\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4648-mdc-6-spring-weight-lever-support-plate-4648\"\u003eMDC 6-Spring Weight Lever Support Plate for High-Performance Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/glwlp-g-l-weight-lever-pin-glwlp\"\u003eGreased Lightning Weight Lever Pin for Kart Clutch Precision\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4650-black-spring-stock-4650\"\u003eStock Black Spring for Standard Horstman Kart Clutch Setup\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562631819582,"sku":"4648-4","price":99.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/greasedlightning-4648-4-g-l-jr-mdc-4-spring-lever-support-4648-4.jpg?v=1763113255"},{"product_id":"4648-mdc-6-spring-weight-lever-support-plate-4648","title":"MDC 6-Spring Weight Lever Support Plate for High-Performance Karts","description":"Advanced racing demands advanced support— the MDC 6-Spring Weight Lever Support Plate provides it robustly. It anchors six springs for customizable clutch characteristics in high-performance setups.\u003cp\u003eKey engineering highlights:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSix-spring capacity for fine-tuned engagement curves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Plate:\u003c\/strong\u003e Handles increased forces without bending.\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003ePrecision Holes:\u003c\/i\u003e Aligns components flawlessly.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWith SKU 4648, achieve dialed-in performance that shaves seconds, while keeping your workbench orderly with modular design. On track, it ensures levers respond predictably, enhancing driver confidence.\u003c\/p\u003e\u003cp\u003eFor pro teams, it's invaluable in experimenting with spring rates, optimizing for specific engines like 100cc or 125cc. The plate's durability means fewer replacements, focusing budget on innovation.\u003c\/p\u003e\u003cp\u003eStructurally, it distributes load evenly, preventing hotspots that degrade performance. This component elevates your MDC Horstman clutch from good to elite, perfect for series where precision wins.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose the 6-spring support plate over a 4-spring version?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The 6-spring configuration allows for more granular tuning of your clutch engagement curve. It is ideal for high-performance setups where you need to distribute load more evenly across the clutch assembly to prevent hotspots and ensure predictable lever response.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this plate compatible with all Horstman MDC clutches?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This plate is specifically designed for the MDC series. It is a heavy-duty upgrade intended for racers looking to experiment with spring rates and optimize performance for 100cc or 125cc engines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this plate require special tools for installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e While standard shop tools are generally sufficient, ensure your clutch assembly is clean and that you are using the correct spring tensioners to seat the springs properly within the precision-machined holes of the plate.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does this plate improve my kart's performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By providing a more rigid, heavy-duty structure, this plate prevents bending under high-torque loads. This ensures that your clutch levers operate consistently, which translates to more predictable launches and improved power transfer on the track.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4648-4-g-l-jr-mdc-4-spring-lever-support-4648-4\"\u003eG\/L Jr. MDC 4-Spring Lever Support for Advanced Kart Clutches\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcwl-reaper-weight-lever-rcwl\"\u003eReaper Weight Lever - Tunable Horstman Clutch Element\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4650-black-spring-stock-4650\"\u003eStock Black Spring for Standard Horstman Kart Clutch Setup\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4649-red-spring-modified-4649\"\u003eModified Red Spring for Horstman Kart Clutches\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mdclr-3344-mdc-lever-ring-mdclr\"\u003eHorstman MDC Lever Ring - MDCLR Drive-Line Upgrade - 4-Cycle Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562646139198,"sku":"4648","price":89.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/mdc-4648-mdc-6-spring-weight-lever-support-plate-4648.jpg?v=1763113545"},{"product_id":"4642-floater-plate-085-4642","title":"Horstman Floater Plate 085 for Balanced Kart Clutch Action","description":"Balance is key in clutch design, and the Horstman Floater Plate 085 delivers it flawlessly. At 0.085 inches thick, it spaces components ideally, ensuring even distribution of force across your kart's drivetrain.\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Thickness:\u003c\/strong\u003e Prevents uneven engagement that causes hotspots.\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003eMaterial Durability:\u003c\/i\u003e Withstands compression without deforming.\u003c\/li\u003e\n\u003cli\u003eCompatible with multiple Horstman configurations for versatility.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eInstalling the SKU 4642 results in smoother operation, reducing judder during starts and extending part life. For racers, this means more time pushing limits and less on adjustments, keeping your setup organized and race-focused.\u003c\/p\u003e\u003cp\u003eIn junior classes or pro circuits, it helps fine-tune clutch feel, aiding precise control on varied surfaces. Its slim profile doesn't add unnecessary weight, preserving your kart's agility.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is the thickness of the floater plate important for my Horstman clutch?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The 0.085\" thickness is critical for maintaining the correct air gap and spacing within your clutch assembly. Using the proper thickness ensures even force distribution, which prevents uneven engagement and reduces the risk of creating hotspots on your clutch discs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the 085 floater plate improve my kart's performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By ensuring precise spacing, this plate promotes smoother clutch operation. This reduces judder during starts, provides more consistent power transfer, and helps extend the overall lifespan of your clutch components.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: When should I replace my clutch floater plate?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should inspect your floater plate for signs of warping, heat discoloration, or scoring. If the plate no longer sits perfectly flat or shows signs of deformation, it should be replaced to maintain optimal clutch engagement and prevent damage to other drivetrain parts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this plate compatible with all Horstman clutches?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This 085 floater plate is designed for specific Horstman configurations. Always verify your current clutch setup and manual to ensure that the 0.085\" thickness matches your required clearance specifications.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcfp105-reaper-floater-plate-105-rcfp105\"\u003eHorstman Reaper .105\" Floater Plate - Precision Clutch Enhancer - 4-Cycle\/KT100\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcfp075-reaper-floater-plate-075-rcfp075\"\u003eHorstman Reaper Floater Plate - 0.075\" Thickness - Sprint Kart Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/x5-075-floater-plate-x5fp075\"\u003eX5 075 Floater Plate for Efficient Horstman Clutch Flow\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcpp-reaper-pressure-plate-rcpp\"\u003eReaper Pressure Plate - Dynamic Horstman Clutch Controller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcsp-reaper-clutch-spacer-rcsp\"\u003eReaper Clutch Spacer for Precise Horstman Alignment\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562661114174,"sku":"4642","price":34.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/greasedlightning-4642-floater-plate-085-4642.jpg?v=1763113891"},{"product_id":"4635-14t-up-bearing-4635","title":"Horstman 14T Driver\/Drum Up Bearing for Smooth Kart Operation","description":"\u003cp\u003eFriction is the enemy of speed, but the Horstman 14T Up Bearing changes that equation. Tailored for 14-tooth driver drums, this bearing ensures fluid rotation, minimizing drag that robs your kart of precious horsepower.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eLow-Friction Design:\u003c\/b\u003e High-quality materials spin effortlessly under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Fit:\u003c\/strong\u003e Aligns perfectly with Horstman Greased Lightning components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eHeat Dissipation:\u003c\/em\u003e Keeps temperatures down for sustained performance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIn practice, installing the SKU 4635 leads to noticeably quieter operation and quicker rev-matching, aiding acceleration out of turns. For organized pit crews, it's a simple swap that boosts overall driveline efficiency without complex tools.\u003c\/p\u003e\u003cp\u003eRacers in junior and senior classes benefit from its durability, which extends intervals between overhauls. Pair it with fresh lubricants for peak results, turning potential weak points into strengths on the circuit.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this bearing compatible with all Horstman clutch drums?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This specific bearing is precision-engineered for 14-tooth driver drums. Please verify your drum tooth count before installation to ensure a proper fit and optimal performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my clutch bearing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e To maintain peak driveline efficiency and prevent drag, we recommend inspecting your bearing during every major engine overhaul. If you notice increased noise or resistance during rotation, it is time for a replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need special tools to install the 4635 bearing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No, this bearing is designed for a straightforward swap. It is intended to align perfectly with Horstman Greased Lightning components, allowing for quick maintenance in the pits without the need for complex specialized tools.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Should I lubricate this bearing before use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes. For the best results and to maximize the lifespan of the component, we recommend pairing this bearing with fresh, high-quality lubricants during installation.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcdh-reaper-drive-hub-rcdh\"\u003eReaper Drive Hub - High-Performance Horstman Clutch Core\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4638-splined-drive-hub-4638\"\u003eHorstman Splined Drive Hub for Seamless Kart Power Connection\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4413-4416-drum-specify-tooth-13-16-4412-4416\"\u003eHorstman MDC Clutch Drum with 13T-16T Tooth Options for Kart Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcsp-reaper-clutch-spacer-rcsp\"\u003eReaper Clutch Spacer for Precise Horstman Alignment\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4651-horstman-clutch-key-4651\"\u003eHorstman Clutch Key for Secure Kart Driveline Locking\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562680545598,"sku":"4635","price":18.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/greasedlightning-4635-14t-up-bearing-4635.jpg?v=1763114241"},{"product_id":"mdclr-3344-mdc-lever-ring-mdclr","title":"Horstman MDC Lever Ring - MDCLR Drive-Line Upgrade - 4-Cycle Racing","description":"\u003ch2\u003ePrecision Engagement from the Premier Kart Store\u003c\/h2\u003e\n\u003cp\u003eWhen top-tier mechanics at any premier kart store build a championship-winning 4-cycle drive-line, the Horstman MDC Lever Ring (MPN: MDCLR) is the non-negotiable component that locks in high-RPM stability. Designed specifically for the legendary Horstman MDC clutch system, this precision-machined ring secures the lever mechanism to completely eliminate the slippage that destroys lap times. If you've been searching for a go karts shop near me to solve inconsistent clutch engagement, this is the exact technical solution required. By maintaining rigid structural integrity under extreme centrifugal forces, the MDCLR ensures that every ounce of engine torque transfers directly to the rear axle without hesitation.\u003c\/p\u003e\n\u003ch2\u003eOutperforming Standard Parts For Go Karts Near Me\u003c\/h2\u003e\n\u003cp\u003eIn the highly competitive world of sprint and endurance racing, standard components simply cannot withstand the thermal load and vibration of a modified 4-cycle engine. While you might be hunting for engine filters or basic parts for go karts near me, upgrading your clutch's internal architecture is what actually wins races. The Horstman MDC Lever Ring acts as the critical retaining boundary for your clutch levers, preventing them from deflecting under load. This means your clutch engages at the exact RPM you tuned it for, lap after grueling lap. Whether you are running a restricted stock class or a heavy modified setup, this ring guarantees that your power delivery remains aggressive, predictable, and flawlessly synchronized.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications \u0026amp; Racing Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAbsolute Lever Stability:\u003c\/strong\u003e Prevents lever deflection during high-RPM engagement, ensuring immediate power transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Distortion Resistance:\u003c\/strong\u003e Machined from high-strength alloy to withstand the extreme heat generated by slipping clutches in tight corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExact Horstman Fitment:\u003c\/strong\u003e Engineered specifically for the MDC (Multi-Disc Clutch) system, guaranteeing zero-tolerance integration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent Engagement RPM:\u003c\/strong\u003e Locks the lever geometry in place so your stall speed remains identical from the green flag to the checkered.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Rotational Mass:\u003c\/strong\u003e Optimized profile provides maximum strength without adding unnecessary weight to your drive-line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRapid Trackside Maintenance:\u003c\/strong\u003e Drop-in installation allows mechanics to rebuild the clutch quickly between heats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Friction Disc Life:\u003c\/strong\u003e By eliminating erratic lever movement, the ring prevents uneven wear on your clutch discs and floaters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eStop losing tenths of a second to sloppy power delivery. The Horstman MDC Lever Ring is the definitive mechanical advantage for racers who demand absolute perfection from their drive-line. Secure your clutch architecture today and dominate the apex.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary purpose of the Horstman MDC Lever Ring?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The MDCLR is designed to secure the lever mechanism within the Horstman MDC clutch system. By preventing lever deflection under high-RPM centrifugal forces, it ensures consistent clutch engagement and eliminates power-robbing slippage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the MDCLR compatible with other Horstman clutch models?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This specific lever ring is engineered for the MDC (Multi-Disc Clutch) system. It is a precision-fit component; please ensure your clutch is an MDC model to guarantee zero-tolerance integration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does this ring affect my clutch maintenance routine?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The MDCLR features a drop-in design, allowing for rapid trackside maintenance. It is an essential component to check during clutch rebuilds to ensure your lever geometry remains locked in place, which also helps extend the life of your friction discs and floaters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will installing this ring change my engagement RPM?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e While the ring itself does not change your stall speed, it ensures that your clutch engages at the exact RPM you have tuned it for. By eliminating erratic lever movement, it provides the stability required to maintain your desired engagement point from the start of the race to the finish.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4648-mdc-6-spring-weight-lever-support-plate-4648\"\u003eMDC 6-Spring Weight Lever Support Plate for High-Performance Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcpp-reaper-pressure-plate-rcpp\"\u003eReaper Pressure Plate - Dynamic Horstman Clutch Controller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcfp105-reaper-floater-plate-105-rcfp105\"\u003eHorstman Reaper .105\" Floater Plate - Precision Clutch Enhancer - 4-Cycle\/KT100\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rcwl-reaper-weight-lever-rcwl\"\u003eReaper Weight Lever - Tunable Horstman Clutch Element\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/4651-horstman-clutch-key-4651\"\u003eHorstman Clutch Key for Secure Kart Driveline Locking\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"Default Title","offer_id":52562701615422,"sku":"MDCLR","price":18.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/mdc-mdclr-3344-mdc-lever-ring-mdclr.jpg?v=1763114505"},{"product_id":"4413-4416-drum-specify-tooth-13-16-4412-4416","title":"Horstman MDC Clutch Drum with 13T-16T Tooth Options for Kart Racing","description":"\u003cp\u003eDiscover the pinnacle of kart racing performance with the Horstman MDC Clutch Drum, a precision-engineered component designed to elevate your drivetrain's efficiency. This versatile clutch drum is available in tooth configurations ranging from 13T to 16T, with the #35 15T variant offering an ideal balance for mid-range acceleration and top-end speed. Crafted from high-strength materials, the Horstman MDC Drum withstands the intense demands of competitive karting, ensuring long-lasting durability even under high-speed conditions.\u003c\/p\u003e\u003cp\u003eAt the heart of any high-performance kart is a reliable clutch system, and the Horstman MDC series sets the standard. This #35 15T drum facilitates seamless engagement and disengagement, minimizing power loss and maximizing torque transfer to the rear wheels. Whether you're navigating tight corners or blasting down straights, the 15T tooth count provides fine-tuning to match your engine's RPM range and track preferences. It delivers quick response without sacrificing smoothness, making it perfect for versatile racing scenarios.\u003c\/p\u003e\u003cp\u003eInstallation is straightforward, making it a favorite among both novice and professional kart builders. Specifically optimized for #35 chain systems and MDC clutch assemblies, this 15T variant integrates effortlessly into your existing setup. Its robust construction resists wear from chain impacts and heat buildup, reducing maintenance needs and downtime. Racers trust Horstman for their commitment to innovation, blending aerospace-grade engineering with practical racing insights to deliver components that perform when it matters most.\u003c\/p\u003e\u003cp\u003eEnhance your kart's responsiveness and reliability with this essential drive-line part, particularly the #35 15T option for balanced performance. The Horstman MDC Clutch Drum not only boosts overall vehicle performance but also contributes to safer, more controlled racing experiences. Available through leading kart supply stores, it's the go-to choice for enthusiasts aiming to shave seconds off their lap times. Invest in quality that translates to victories on the circuit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePrecision-machined for exact fit and function with 15T teeth\u003c\/li\u003e\n\u003cli\u003eMultiple tooth options available: 13T, 14T, 15T, 16T for versatility\u003c\/li\u003e\n\u003cli\u003eIdeal for LO206, Animal, and other popular kart engines with #35 chain\u003c\/li\u003e\n\u003cli\u003ePromotes efficient chain engagement and reduced vibration at 15T\u003c\/li\u003e\n\u003cli\u003eBacked by Horstman's reputation for excellence in clutch technology\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDon't settle for subpar parts—equip your kart with the Horstman MDC Clutch Drum in #35 15T and feel the difference in every race.\u003c\/p\u003e","brand":"Horstman","offers":[{"title":"#35 15T","offer_id":52568993857854,"sku":"4412-4416#35 15T","price":60.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/mdc-4413-4416-drum-specify-tooth-13-16-4412-4416.jpg?v=1763125214"},{"product_id":"4417-4421-drum-specify-tooth-17-21-4417-4421","title":"Horstman MDC Clutch Drum - #35 Chain 17T-21T - 4-Cycle Sprint \u0026 Oval Racing","description":"\u003cp\u003eMaximizing rotational energy transfer from the crankshaft to the rear axle requires precision-machined new parts, which is exactly why our online kart store stocks the Horstman MDC Clutch Drum. Engineered specifically for high-stress kart racing applications, this drum minimizes rotational mass while maintaining the structural integrity required to handle aggressive engagement profiles. When you are dialing in your gear ratios for tight sprint tracks or sweeping dirt ovals, selecting the correct tooth count (available from 17T to 21T for #35 chain) dictates your exit speed and low-end torque delivery.\u003c\/p\u003e\u003ch2\u003eOptimizing Driveline Efficiency Beyond the Race Wheel\u003c\/h2\u003e\u003cp\u003eWhile many drivers focus their tuning efforts on tire pressures or a go kart steering wheel upgrade to improve handling, the driveline is where races are won or lost. The Horstman MDC drum features advanced metallurgy that resists bell-mouthing and warping under extreme thermal loads. This ensures consistent shoe-to-drum contact area, preventing the dreaded late-race clutch slip that plagues inferior components. Just as you meticulously select the right engine oil to reduce internal friction, upgrading your clutch drum ensures every ounce of horsepower reaches the track surface with zero hesitation.\u003c\/p\u003e\u003ch2\u003eSeamless Integration with Go Kart Wheels Tires and Gearing\u003c\/h2\u003e\u003cp\u003eYour gear ratio directly impacts how your go kart wheels tires hook up out of the corner. By swapping between the 17T and 21T configurations, mechanics can fine-tune the final drive ratio without drastically altering the rear axle sprocket size. This keeps the chain clearance optimal and reduces the risk of track debris derailments. The MDC drum is precision-balanced to eliminate harmonic vibrations at peak RPMs, translating to smoother power delivery and reduced wear on your crankshaft bearings. Maintaining your driveline is just as critical as the initial installation; regularly inspecting the drum for signs of heat discoloration or uneven wear on the sprocket teeth will keep your setup running at peak efficiency.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision-Machined Tolerances:\u003c\/strong\u003e Eliminates runout and ensures concentric engagement for maximum torque transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Thermal Capacity:\u003c\/strong\u003e High-grade steel construction dissipates heat rapidly, preventing clutch fade during extended mains.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable Tooth Configurations:\u003c\/strong\u003e Available in 17T through 21T for #35 chain pitch, allowing granular final drive tuning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Rotational Mass:\u003c\/strong\u003e Lightweight profile improves throttle response and engine spool-up times out of tight hairpins.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWear-Resistant Sprocket Teeth:\u003c\/strong\u003e Hardened drive teeth extend chain life and maintain pitch accuracy under heavy loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect MDC Compatibility:\u003c\/strong\u003e Engineered as a drop-in replacement for all Horstman MDC clutch assemblies.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Horstman","offers":[{"title":"#35 17T","offer_id":52568993890622,"sku":"4417-4421#35 17T","price":64.16,"currency_code":"USD","in_stock":true},{"title":"#35 18T","offer_id":53239552835902,"sku":"4417-4421#35 18T","price":64.16,"currency_code":"USD","in_stock":true},{"title":"#35 19T","offer_id":53239552868670,"sku":"4417-4421#35 19T","price":64.16,"currency_code":"USD","in_stock":true},{"title":"#35 21T","offer_id":53239553098046,"sku":"4417-4421#35 21T","price":64.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/mdc-4417-4421-drum-specify-tooth-17-21-4417-4421.jpg?v=1763125214"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/collections\/greasedlightning-4648-4-g-l-jr-mdc-4-spring-lever-support-4648-4.jpg?v=1788979787","url":"https:\/\/swiftkarting.com\/collections\/horstman-mdc-kart-clutch-parts-springs-drums.oembed","provider":"Swift Karting","version":"1.0","type":"link"}