{"title":"Viper Assembled Clutches","description":"\u003cp\u003eAssembled Viper clutches are complete centrifugal units (typically 6-spring, 1-disc or 2-disc) with a 3\/4 inch crankshaft bore, sold without a driver so they can be fitted to matching sprockets or hubs. Centrifugal shoes or pads move outward as engine speed rises, so the clutch engages automatically without a pedal; extra discs increase friction area and heat capacity for higher-load kart drive-lines.\u003c\/p\u003e","products":[{"product_id":"3-4-viper-6-spring-clutch-without-driver-3-disc-aluminum-drum-choose-drum-color-fcdc-3d-a","title":"3\/4\" Viper 6-Spring Clutch without Driver - 3-Disc Aluminum Drum (Choose Color: Black, Blue, Red)","description":"\u003cp\u003eEnhance your kart's performance with the 3\/4\" Viper 6-Spring Clutch in sleek \u003cb\u003eBlack aluminum drum\u003c\/b\u003e, designed for 4-cycle engines. This assembled unit features a lightweight 3-disc configuration for optimal power transfer and durability. Springs are pre-set at .410\" height for consistent engagement, and it includes standard SMCFD8HP disks.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eImportant:\u003c\/b\u003e Does not include a driver. The bold Black finish adds a professional edge to your racing setup. Perfect for drive-line upgrades in competitive kart racing, ensuring smooth acceleration and reliable operation on the track.\u003c\/p\u003e","brand":"Viper","offers":[{"title":"Black","offer_id":52568998510910,"sku":"FCDC-3D-A**Black","price":368.43,"currency_code":"USD","in_stock":true},{"title":"Blue","offer_id":53239553130814,"sku":"FCDC-3D-A**Blue","price":368.43,"currency_code":"USD","in_stock":true},{"title":"Red","offer_id":53239553196350,"sku":"FCDC-3D-A**Red","price":368.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/assembledclutches-3-4-viper-6-spring-clutch-without-driver-3-disc-aluminum-drum-choose-drum-color-fcdc-3d-a.jpg?v=1763125237"},{"product_id":"3-4-viper-6-spring-clutch-without-driver-4-disc-choose-drum-fcdc-4d","title":"3\/4\" Viper 6-Spring Clutch without Driver (4-Disc) - Choose Your Drum Pattern","description":"\u003cp\u003eDiscover the ultimate upgrade for your kart racing setup with the 3\/4\" Viper 6-Spring Clutch without driver (4-Disc) featuring the Small Pattern steel drum. Engineered for precision and performance, this clutch is a must-have for serious racers looking to optimize their drive-line components. Designed specifically for kart racing enthusiasts, it delivers smooth engagement, reliable power transfer, and exceptional durability under high-stress conditions.\u003c\/p\u003e\u003cp\u003eThis Viper clutch features a robust 4-disc configuration that ensures even distribution of torque, minimizing slippage and maximizing acceleration off the line. The 6-spring design provides adjustable tension for fine-tuning to your engine's specifications, allowing you to adapt to various track conditions and racing styles. Springs come preset at .440\" for immediate usability, but they can be easily customized for your needs. The Small Pattern drum offers a compact, lightweight fit ideal for standard kart configurations.\u003c\/p\u003e\u003cp\u003eEach clutch is assembled with high-quality Rockstar disks, known for their superior friction properties and resistance to wear. This means longer life and consistent performance lap after lap. As of January 1, 2023, every unit includes the essential AP144 Spacer Kit, which helps maintain proper alignment and spacing for optimal operation. Additionally, the BCWB\/BCWN Weight Kit is provided (not pre-installed), giving you the flexibility to add or adjust weights for balanced rotation and improved handling.\u003c\/p\u003e\u003cp\u003eThe Small Pattern drum ensures compatibility with a wide range of kart setups, providing a precise match for your drive-line needs. This clutch allows you to select this option for seamless integration into your system. Whether you're building a new kart or upgrading an existing one, this clutch fits perfectly into categories like Drive-line Components, Clutches \u0026amp; Parts, Viper Clutches, and Assembled Clutches.\u003c\/p\u003e\u003cp\u003eIn the world of kart racing, every component counts towards shaving seconds off your lap times. The Viper 6-Spring Clutch with Small Pattern drum stands out for its lightweight construction, which reduces rotational mass and enhances throttle response. It's ideal for a range of engines and chassis types, making it a versatile choice for both novice and professional drivers. The absence of a driver hub allows for custom adaptations, giving you more control over your setup.\u003c\/p\u003e\u003cp\u003eMaintenance is straightforward with this clutch. The modular design facilitates quick disassembly and reassembly, so you can inspect and replace parts as needed without specialized tools. Paired with the included weight kit, you can experiment with different configurations to find the sweet spot for your racing class—be it sprint, endurance, or oval track events. The Small Pattern drum excels in applications requiring a tighter, more responsive fit.\u003c\/p\u003e\u003cp\u003eInvest in reliability and performance with the 3\/4\" Viper 6-Spring Clutch featuring the Small Pattern drum. It's not just a part; it's a competitive edge. Compatible with leading kart brands and built to withstand the rigors of intense racing, this clutch will keep you ahead of the pack. Explore our full range of Viper clutches and drive-line accessories to complete your build.\u003c\/p\u003e\u003cp\u003eKey features include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e4-Disc design for enhanced torque handling\u003c\/li\u003e\n\u003cli\u003ePreset .440\" springs for easy setup\u003c\/li\u003e\n\u003cli\u003eRockstar disks for premium friction\u003c\/li\u003e\n\u003cli\u003eAP144 Spacer Kit included (post-01\/01\/2023)\u003c\/li\u003e\n\u003cli\u003eBCWB\/BCWN Weight Kit for customization\u003c\/li\u003e\n\u003cli\u003eSmall Pattern steel drum for standard compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eElevate your kart's performance today with this top-tier clutch solution.\u003c\/p\u003e","brand":"Viper","offers":[{"title":"Small Pattern","offer_id":52568998609214,"sku":"FCDC-4DSmall Pattern","price":388.53,"currency_code":"USD","in_stock":true},{"title":"TURBO Pattern","offer_id":53239555195198,"sku":"FCDC-4DTURBO Pattern","price":393.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/assembledclutches-3-4-viper-6-spring-clutch-without-driver-4-disc-choose-drum-fcdc-4d.jpg?v=1763125238"},{"product_id":"34-viper-6-spring-2-disc-clutch-no-driver-fcdc-2d","title":"3\/4\" Viper 6-Spring 2-Disc Clutch - No Driver for 4-Cycle Karts","description":"\u003ch2\u003eHigh-Performance Viper 6-Spring 2-Disc Clutch for 4-Cycle Applications\u003c\/h2\u003e\n\u003cp\u003eUpgrade your 4-cycle kart's drivetrain with this precision-engineered \u003cstrong\u003e3\/4\" Viper 6-Spring Clutch (2-Disc)\u003c\/strong\u003e. Designed specifically for reliable power transfer in go-kart racing, this clutch delivers smooth engagement and consistent performance on the track. Note: This unit \u003cem\u003edoes not include the driver\u003c\/em\u003e, allowing you to pair it with your existing or custom driver setup for maximum flexibility.\u003c\/p\u003e\n\u003ch3\u003eKey Features:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\/4\" Bore:\u003c\/strong\u003e Perfect fit for standard 4-cycle kart engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6-Spring Design:\u003c\/strong\u003e Provides optimal grip and adjustability for varying track conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-Set Springs at .430\" Height:\u003c\/strong\u003e Factory-tuned for immediate use, ensuring balanced slip and hold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Components Included:\u003c\/strong\u003e Equipped with high-quality SMCFD8 disks and a .105\" floater for enhanced durability and heat dissipation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-Disc Configuration:\u003c\/strong\u003e Increases surface area for better torque handling without excessive weight.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis clutch is built to withstand the demands of competitive karting, offering racers a dependable component that minimizes downtime and maximizes speed. Ideal for club racing, practice sessions, or high-stakes events where every shift counts. Easy to install and maintain, it's a go-to choice for mechanics and drivers seeking proven 4-cycle performance.\u003c\/p\u003e\n\u003cp\u003eWhether you're rebuilding your driveline or fine-tuning for peak output, the Viper clutch stands out for its robust construction and race-ready setup. Pair it with compatible drivers and sprockets for a seamless integration into your kart's powertrain.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch4\u003eDoes this clutch come with a driver?\u003c\/h4\u003e\n\u003cp\u003eNo, the driver is not included. It ships without the driver for custom compatibility.\u003c\/p\u003e\n\u003ch4\u003eWhat engine type is this clutch designed for?\u003c\/h4\u003e\n\u003cp\u003eIt's a 3\/4\" 4-cycle clutch, suited for various 4-cycle kart engines.\u003c\/p\u003e\n\u003ch4\u003eAre the springs adjustable?\u003c\/h4\u003e\n\u003cp\u003eSprings are pre-set at .430\" height but can be tuned as needed for your setup.\u003c\/p\u003e\n\u003ch4\u003eWhat disks and floater are included?\u003c\/h4\u003e\n\u003cp\u003eComes standard with SMCFD8 disks and a .105\" floater.\u003c\/p\u003e\n\u003ch4\u003eIs this a 2-disc or single-disc clutch?\u003c\/h4\u003e\n\u003cp\u003eThis is a 2-disc configuration for improved performance.\u003c\/p\u003e","brand":"Swift Karting","offers":[{"title":"Default Title","offer_id":53244305146174,"sku":"FCDC-2D","price":296.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/3_4__Viper_6-Spring_Clutch_without_driver_2-Disc.jpg?v=1774898066"},{"product_id":"34-viper-6-spring-2-disc-clutch-steel-vented-drum-no-driver","title":"3\/4\" Viper 6-Spring 2-Disc Clutch with Steel Vented Drum - No Driver","description":"\u003ch2\u003eHigh-Performance Viper 3\/4\" 6-Spring Clutch for 4-Cycle Karts\u003c\/h2\u003e\n\u003cp\u003eEquip your racing kart with this reliable 3\/4\" Viper 6-spring clutch, designed specifically for 4-cycle applications. This 2-disc model pairs perfectly with a steel vented drum for enhanced durability and performance on the track. Note that it ships without a driver, allowing for custom configurations tailored to your setup.\u003c\/p\u003e\n\u003ch3\u003eKey Features:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel Vented Two-Disk Drum:\u003c\/strong\u003e Provides robust construction with ventilation for better heat management during extended runs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-Set Springs:\u003c\/strong\u003e Factory-set at .430\" height for consistent engagement right out of the box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Components:\u003c\/strong\u003e Includes SMCFD8HP disks and .095\" floater for smooth operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilver Lever Support:\u003c\/strong\u003e Adds strength and a clean finish to the assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6-Spring, 2-Disc Design:\u003c\/strong\u003e Optimized for 3\/4\" 4-cycle clutches, delivering precise power transfer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis clutch is built to handle the demands of competitive karting, ensuring quick acceleration and reliable shifting. The vented drum design helps maintain optimal temperatures, reducing wear over time. Ideal for racers seeking a direct replacement or upgrade without unnecessary extras like a driver.\u003c\/p\u003e\n\u003cp\u003eAssembly is straightforward for experienced builders, and all critical specs are pre-configured for immediate use. Pair it with your existing driver or source one separately to complete your drivetrain.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch4\u003eDoes this clutch include a driver?\u003c\/h4\u003e\n\u003cp\u003eNo, it does not come with a driver. This allows flexibility for your specific kart setup.\u003c\/p\u003e\n\u003ch4\u003eWhat type of drum is included?\u003c\/h4\u003e\n\u003cp\u003eIt comes with a steel vented two-disk drum for superior strength and cooling.\u003c\/p\u003e\n\u003ch4\u003eAre the springs pre-adjusted?\u003c\/h4\u003e\n\u003cp\u003eYes, springs are pre-set at .430\" height for optimal performance.\u003c\/p\u003e\n\u003ch4\u003eWhat disks and floater are standard?\u003c\/h4\u003e\n\u003cp\u003eComes standard with SMCFD8HP disks and a .095\" floater.\u003c\/p\u003e\n\u003ch4\u003eIs this for 4-cycle engines?\u003c\/h4\u003e\n\u003cp\u003eYes, it's a 3\/4\" 4-cycle clutch.\u003c\/p\u003e","brand":"Viper","offers":[{"title":"Default Title","offer_id":53244305899838,"sku":"FCDC-2D-SD","price":319.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/3_4__Viper_6-Spring_Clutch_without_driver_2-Disc_STEEL_VENTED_Drum.jpg?v=1774898104"},{"product_id":"viper-3-4-6-spring-3-disc-clutch-steel-drum-no-driver-fcdc-3d","title":"Viper 3\/4\" 6-Spring 3-Disc Clutch - Steel Drum, No Driver","description":"\u003ch2\u003eViper 6-Spring 3-Disc Clutch for 3\/4\" 4-Cycle Applications\u003c\/h2\u003e\u003cp\u003eEquip your go-kart with this reliable Viper 6-spring clutch, optimized for 3\/4\" 4-cycle engines. The 3-disc design ensures smooth power delivery and consistent engagement, making it a go-to choice for racers seeking dependable drivetrain performance. This clutch comes standard with a robust steel drum, built to handle the demands of competitive karting while resisting wear from high RPMs and heat.\u003c\/p\u003e\u003cp\u003eSprings arrive pre-set to a precise .410\" height, allowing for quick installation and immediate track-ready setup without guesswork. It includes a weight kit for fine-tuning clutch engagement speed to match your engine's characteristics and track conditions – note that weights are supplied uninstalled for custom configuration. High-performance SMCFD8HP disks are standard, providing excellent friction and longevity under racing stress.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e3\/4\" bore specifically for 4-cycle kart engines\u003c\/li\u003e\n\u003cli\u003eSteel drum for enhanced strength and durability\u003c\/li\u003e\n\u003cli\u003e6-spring setup with pre-set .410\" height\u003c\/li\u003e\n\u003cli\u003e3-disc configuration with SMCFD8HP disks included\u003c\/li\u003e\n\u003cli\u003eWeight kit provided (requires installation)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDriver not included\u003c\/strong\u003e – order separately for complete setup\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis clutch delivers the precision and adjustability needed for everything from club racing to more intense sessions. The steel drum adds peace of mind with its superior heat management compared to lighter alternatives, helping maintain consistent shifts lap after lap. Ideal for builders and tuners who prioritize quality components in their drive-line assembly.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Does this clutch include the driver?\u003c\/strong\u003e\u003cbr\u003eA: No, the driver is not included and must be purchased separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What type of disks come with it?\u003c\/strong\u003e\u003cbr\u003eA: It comes standard with SMCFD8HP disks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Are the springs pre-installed at a specific height?\u003c\/strong\u003e\u003cbr\u003eA: Yes, springs are pre-set at .410\" height for optimal out-of-box performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is the weight kit installed?\u003c\/strong\u003e\u003cbr\u003eA: The weight kit is included but not installed, allowing for custom tuning.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What engines is this designed for?\u003c\/strong\u003e\u003cbr\u003eA: This is a 3\/4\" clutch for 4-cycle kart engines.\u003c\/p\u003e","brand":"Viper","offers":[{"title":"Default Title","offer_id":53244306522430,"sku":"FCDC-3D","price":384.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/3_4__Viper_6-Spring_Clutch_without_driver_3-Disc_with_STEEL_Drum.jpg?v=1774898139"},{"product_id":"34-viper-6-spring-clutch-3-disc-aluminum-drum-no-driver","title":"3\/4\" Viper 6-Spring 3-Disc Clutch - Aluminum Drum, No Driver","description":"\u003ch2\u003e3\/4\" Viper 6-Spring Clutch (3-Disc) with Aluminum Drum\u003c\/h2\u003e\n\u003cp\u003eEquip your 4-cycle kart with this reliable 3\/4\" Viper 6-spring clutch, designed without a driver for custom setups. The standout feature is the silver aluminum drum, which comes standard for durability and performance in racing conditions. This clutch is built for smooth power transfer in 4-cycle applications.\u003c\/p\u003e\n\u003cp\u003eSprings arrive pre-set at .410\" height, ready for immediate installation without additional adjustments. A weight kit is included to allow fine-tuning of engagement and slip characteristics, though it requires separate installation. It ships standard with SMCFD8HP disks, ensuring consistent friction and reliable operation.\u003c\/p\u003e\n\u003cdiv style=\"background: #f9f9f9; padding: 20px; border-radius: 8px;\"\u003e\n\u003ch3\u003eKey Features:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3\/4\" bore specifically for 4-cycle engines\u003c\/li\u003e\n\u003cli\u003e6-spring configuration for progressive engagement\u003c\/li\u003e\n\u003cli\u003e3-disc setup for optimal torque handling\u003c\/li\u003e\n\u003cli\u003eLightweight silver aluminum drum (standard)\u003c\/li\u003e\n\u003cli\u003ePre-set springs at .410\" height\u003c\/li\u003e\n\u003cli\u003eWeight kit included (not pre-installed)\u003c\/li\u003e\n\u003cli\u003eSMCFD8HP disks standard\u003c\/li\u003e\n\u003cli\u003eDriver not included – customize to your needs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003eThis clutch delivers dependable performance for kart racers seeking a balance of strength and responsiveness. Ideal for track use where precise power delivery matters. Note that all components are matched for Viper specifications, making it a direct fit for compatible 4-cycle drivetrains.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this clutch include a driver?\u003c\/strong\u003e\u003cbr\u003eNo, the driver is not included, allowing for custom driver selection based on your engine and sprocket setup.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat type of drum is used?\u003c\/strong\u003e\u003cbr\u003eSilver aluminum drum is standard, providing a lightweight yet robust option.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the springs pre-adjusted?\u003c\/strong\u003e\u003cbr\u003eYes, springs are pre-set to .410\" height for out-of-the-box readiness.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs a weight kit provided?\u003c\/strong\u003e\u003cbr\u003eYes, a weight kit is included but not installed, so you can tune it to your preferences.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat disks come with it?\u003c\/strong\u003e\u003cbr\u003eComes standard with SMCFD8HP disks for reliable performance.\u003c\/p\u003e","brand":"Swift Karting","offers":[{"title":"Default Title","offer_id":53244306850110,"sku":"FCDC-3D-A","price":364.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/3_4__Viper_6-Spring_Clutch_without_driver_3-Disc_ALUMINUM_DRUM.jpg?v=1774898181"},{"product_id":"viper-3-4-2-disc-6-spring-clutch-blue-no-driver","title":"Viper 3\/4\" 2-Disc 6-Spring Clutch Blue Anodized - No Driver","description":"\u003ch2\u003ePower Up Your Kart with Viper Blue 2-Disc 6-Spring Clutch\u003c\/h2\u003e\u003cp\u003eThis Viper Two Disk Six Spring Clutch delivers reliable engagement and smooth power delivery for competitive karting. Its eye-catching blue anodized lever support and non-vented drum provide not just style but also enhanced durability against wear in demanding track conditions. Designed specifically for 3\/4-inch shaft four-cycle engines, it ensures a precise fit without modifications.\u003c\/p\u003e\u003cp\u003eShipped ready to install with high-performance SMCFD8HP linings and a .095-inch floater, this clutch optimizes friction and heat dissipation for consistent shifts. The six-spring setup allows tunable engagement points, helping you dial in the perfect response for your racing style—whether accelerating out of corners or maintaining top speed.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBlue anodized lever support for corrosion resistance and premium aesthetics\u003c\/li\u003e\n\u003cli\u003eBlue anodized non-vented drum for strength and reduced weight\u003c\/li\u003e\n\u003cli\u003eIncludes SMCFD8HP linings for superior grip\u003c\/li\u003e\n\u003cli\u003eFeatures .095\" floater for smooth operation\u003c\/li\u003e\n\u003cli\u003eCompatible with 3\/4\" shaft four-cycle engines\u003c\/li\u003e\n\u003cli\u003eExcludes sprocket and driver for custom builds\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIdeal for racers seeking aftermarket upgrades that boost drivetrain efficiency. The robust construction handles high RPMs while minimizing slippage, giving you confidence lap after lap. Easy to service and maintain, it's a go-to choice for pit crews focused on performance without complexity.\u003c\/p\u003e\u003ch3\u003ePerformance Advantages\u003c\/h3\u003e\u003cp\u003eExperience quicker acceleration and better throttle response thanks to the multi-disc design. The anodized components resist fading and maintain clutch bite over extended sessions, reducing downtime and keeping you on track.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes this clutch include a sprocket?\u003c\/strong\u003e No, it does not include a sprocket. Pair it with your existing or custom sprocket for complete setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat shaft size does it fit?\u003c\/strong\u003e Designed for 3\/4-inch shafts on four-cycle engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAre the linings and floater included?\u003c\/strong\u003e Yes, ships with SMCFD8HP linings and .095-inch floater.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs a driver included?\u003c\/strong\u003e No driver is included; this is the clutch without driver as specified.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat engines is it compatible with?\u003c\/strong\u003e Fits 3\/4-inch shaft four-cycle engines commonly used in karting.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Viper","offers":[{"title":"Default Title","offer_id":53244308422974,"sku":"FCDC-BLUE2D","price":310.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/3_4__Viper_6-Spring_Clutch_without_driver_2-Disc_BLUE.jpg?v=1774898311"},{"product_id":"34-viper-boxstock-1-disc-clutch-6-spring","title":"3\/4\" Viper Boxstock 1-Disc Clutch - 6-Spring Big Pin Design","description":"\u003cp\u003eEquip your kart for Boxstock class racing with this precision-engineered \u003cstrong\u003e3\/4\" Viper 6-Spring Clutch (1-Disc)\u003c\/strong\u003e. Designed without a driver, this Big Pin Boxstock clutch delivers reliable performance straight out of the box. It features our innovative FCDC-BPL lever for smooth operation and enhanced control.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOne weight bolt pre-installed in the outer position for immediate setup\u003c\/li\u003e\n\u003cli\u003eSix additional weight bolts and nuts included for easy tuning and customization\u003c\/li\u003e\n\u003cli\u003eStandard SMCFD8HP disc ensures consistent friction and engagement\u003c\/li\u003e\n\u003cli\u003eGold .085\" Viper springs preset at .430\" for optimal spring tension\u003c\/li\u003e\n\u003cli\u003eLever support and drum finished in striking blue for durability and style\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis clutch is built for racers seeking dependable power transfer in competitive Boxstock environments. The 6-spring configuration provides progressive engagement, reducing shock loads on your drivetrain while maximizing acceleration. The included hardware allows quick adjustments to match track conditions or engine characteristics, helping you dial in the perfect shift point.\u003c\/p\u003e\u003cp\u003eWhether you're prepping for club races or intense practice sessions, this Viper clutch stands out with its robust construction and thoughtful details. The blue anodized components resist wear, and the big pin design ensures secure operation under high RPMs.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDoes this clutch come with a driver?\u003c\/strong\u003e\u003cbr\u003eNo, it ships without a driver as specified for Boxstock class use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat springs are used?\u003c\/strong\u003e\u003cbr\u003eGold .085\" Viper springs, preset at .430\" for reliable performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre weight bolts included?\u003c\/strong\u003e\u003cbr\u003eYes, one installed in the outer position plus six additional bolts and nuts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat disc is standard?\u003c\/strong\u003e\u003cbr\u003eThe SMCFD8HP disc is included as standard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the lever support and drum?\u003c\/strong\u003e\u003cbr\u003eBoth are blue.\u003c\/p\u003e","brand":"Viper","offers":[{"title":"Default Title","offer_id":53244308914494,"sku":"FCDC-CL1010","price":330.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/3_4__Viper_BOXSTOCK_Clutch_1-Disc.jpg?v=1774898370"},{"product_id":"3-4-viper-boxstock-2-disc-clutch-vented-blue","title":"3\/4\" Viper Boxstock 2-Disc Clutch - Vented Blue High-Performance","description":"\u003ch2\u003e3\/4\" Viper Boxstock 2-Disc Clutch - Vented Blue\u003c\/h2\u003e\n\u003cp\u003eEngineered for Big Pin Boxstock class racing, this 3\/4\" Viper 6-spring clutch delivers without the driver, offering precise control and durability on the track. The vented blue design enhances cooling during intense sessions, while the robust construction ensures consistent engagement.\u003c\/p\u003e\n\u003cp\u003eKey features include the innovative FCDC-BPL lever for smooth operation, one weight bolt pre-installed in the outer position for immediate setup, and six additional weight bolts with nuts for easy tuning to match your kart's needs. It comes equipped with standard SMCFD8 linings paired with a .105\" floater and .010\" shim for optimal friction and longevity. Gold .085\" Viper springs are preset at .430\" for reliable spring tension right out of the box. The striking blue lever support adds a professional finish.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVented blue finish for improved heat dissipation\u003c\/li\u003e\n\u003cli\u003eBig Pin Boxstock class compatibility\u003c\/li\u003e\n\u003cli\u003eFCDC-BPL lever integration\u003c\/li\u003e\n\u003cli\u003ePre-installed outer weight bolt\u003c\/li\u003e\n\u003cli\u003e6 extra weight bolts and nuts included\u003c\/li\u003e\n\u003cli\u003eSMCFD8 linings with .105\" floater (.010\" shim)\u003c\/li\u003e\n\u003cli\u003eGold .085\" springs preset at .430\"\u003c\/li\u003e\n\u003cli\u003eBlue lever support\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePerfect for racers seeking a high-quality, tunable clutch that maintains peak performance in Boxstock competitions. Install and adjust with confidence using the included components—no guesswork required.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch4\u003eDoes this clutch include the driver?\u003c\/h4\u003e\n\u003cp\u003eNo, it ships without the driver as specified.\u003c\/p\u003e\n\u003ch4\u003eWhat springs are used?\u003c\/h4\u003e\n\u003cp\u003eGold .085\" Viper springs preset at .430\".\u003c\/p\u003e\n\u003ch4\u003eAre weight tuning options included?\u003c\/h4\u003e\n\u003cp\u003eYes, one bolt in outer position plus six additional bolts and nuts.\u003c\/p\u003e\n\u003ch4\u003eWhat linings and floater specs?\u003c\/h4\u003e\n\u003cp\u003eStandard SMCFD8 linings with .105\" floater and .010\" shim installed.\u003c\/p\u003e\n\u003ch4\u003eLever details?\u003c\/h4\u003e\n\u003cp\u003eUtilizes the new FCDC-BPL lever with blue support.\u003c\/p\u003e","brand":"Viper","offers":[{"title":"Default Title","offer_id":53244309340478,"sku":"FCDC-CL2020","price":377.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/3_4__Viper_BOXSTOCK_Clutch_2-Disc.jpg?v=1774898405"},{"product_id":"viper-3-4-big-pin-6-spring-two-disk-clutch-silver-no-driver","title":"Viper 3\/4\" Big Pin 6-Spring Two-Disk Clutch - Silver Drum \u0026 Levers, No Driver","description":"\u003cdiv class=\"product-description\"\u003e\n  \u003ch2\u003ePremium Viper Two-Disk Clutch for 3\/4\" Shafts\u003c\/h2\u003e\n  \u003cp\u003eEngineered for reliable performance in kart racing, this Viper two-disk clutch is designed specifically for 3\/4\" shafts. It delivers smooth engagement and consistent power transfer, making it a go-to choice for competitive setups. The striking silver lever support and drum provide not just a sleek look but also enhanced durability under high-stress conditions.\u003c\/p\u003e\n  \u003cp\u003eKey standout features include our heavy-duty FCDC-BPL Big Pin Levers, which ensure precise control and reduced wear. Pre-installed SMCFD8HP linings offer superior friction and heat resistance, while the FCDC-SP85 gold springs—set at .430\"—provide optimal tension for versatile tuning. One weight bolt and nut comes pre-installed in the outer hole, with six additional ones included for fine-tuning your clutch weights to match your track needs.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eSilver lever support and drum for corrosion resistance and style\u003c\/li\u003e\n    \u003cli\u003eFCDC-BPL Big Pin Levers for robust, reliable operation\u003c\/li\u003e\n    \u003cli\u003eSMCFD8HP linings factory-installed for immediate use\u003c\/li\u003e\n    \u003cli\u003eFCDC-SP85 gold springs at .430\" for balanced engagement\u003c\/li\u003e\n    \u003cli\u003eOne weight bolt\/nut installed; six extras provided\u003c\/li\u003e\n    \u003cli\u003ePerfect fit for 3\/4\" shafts—drive sprocket not included (order separately)\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eThis 6-spring configuration allows for adjustable slip points, helping you dial in the perfect response for acceleration and top-end speed. Ideal for drivers seeking a high-quality, ready-to-install drivetrain component without the hassle of basic assembly.\u003c\/p\u003e\n  \u003ch3\u003eWhy Choose This Clutch?\u003c\/h3\u003e\n  \u003cp\u003eBuilt with precision components, it minimizes downtime and maximizes consistency lap after lap. The big pin design handles aggressive shifts, while the two-disk setup distributes load evenly for longevity.\u003c\/p\u003e\n  \u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eDoes this clutch include a driver?\u003c\/strong\u003e No, the driver is not included. This is the clutch without driver configuration.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eWhat shaft size does it fit?\u003c\/strong\u003e Designed exclusively for 3\/4\" shafts.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eWhat type of springs are used?\u003c\/strong\u003e FCDC-SP85 gold springs installed at .430\".\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eAre the linings pre-installed?\u003c\/strong\u003e Yes, SMCFD8HP linings are factory-installed.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eIs the drive sprocket included?\u003c\/strong\u003e No, drive sprocket must be ordered separately.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Viper","offers":[{"title":"Default Title","offer_id":53244310126910,"sku":"FCDC-ES-2","price":344.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/3_4__Viper_Big_Pin_6-Spring_Clutch_without_Driver_Two_Disk_SILVER.jpg?v=1774898468"},{"product_id":"34-viper-6-spring-1-disc-clutch-no-driver","title":"3\/4\" Viper 6-Spring 1-Disc Clutch - No Driver Required - 4-Cycle Kart Ready","description":"\u003ch2\u003eViper 6-Spring Clutch (1-Disc) - 3\/4\" 4-Cycle Powerhouse\u003c\/h2\u003e\n\u003cp\u003eEquip your 4-cycle go-kart with the reliable Viper 6-Spring Clutch in 1-disc configuration. Designed specifically for 3\/4\" applications, this clutch delivers smooth engagement and consistent performance on the track. Note that it ships without a driver, allowing you to pair it with your existing or custom setup for maximum flexibility.\u003c\/p\u003e\n\u003cp\u003eSprings come pre-set to .450\" height right out of the box, ensuring optimal tension and reducing setup time. It arrives standard with the high-quality SMCFD8HP disk, ready for immediate installation and racing action. Perfect for competitive karting where precision drivetrain components make the difference.\u003c\/p\u003e\n\u003ch3\u003eKey Features:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3\/4\" bore tailored for 4-cycle engines\u003c\/li\u003e\n\u003cli\u003e6-spring design for balanced power transfer\u003c\/li\u003e\n\u003cli\u003ePre-set .450\" springs for reliable engagement\u003c\/li\u003e\n\u003cli\u003eIncludes SMCFD8HP disk as standard\u003c\/li\u003e\n\u003cli\u003eNo driver included - build your ideal combo\u003c\/li\u003e\n\u003cli\u003eOptional color choices available (e.g., Black for +$5)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis clutch is built to handle the demands of kart racing, providing durability and responsiveness. Whether you're tuning for club races or practice sessions, the Viper clutch integrates seamlessly into your drive-line setup. Customize further with color options to match your kart's aesthetics without compromising function.\u003c\/p\u003e\n\u003cp\u003eInstallation is straightforward for experienced builders, and the pre-configured springs mean less guesswork during assembly. Focus on what matters - getting back on track faster.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch4\u003eDoes this clutch include a driver?\u003c\/h4\u003e\n\u003cp\u003eNo, the Viper 6-Spring Clutch ships without a driver to allow for custom configurations.\u003c\/p\u003e\n\u003ch4\u003eWhat disk is included?\u003c\/h4\u003e\n\u003cp\u003eIt comes standard with the SMCFD8HP disk.\u003c\/p\u003e\n\u003ch4\u003eAre the springs adjustable?\u003c\/h4\u003e\n\u003cp\u003eSprings are pre-set at .450\" height for optimal performance.\u003c\/p\u003e\n\u003ch4\u003eIs this for 4-cycle engines only?\u003c\/h4\u003e\n\u003cp\u003eYes, specified as a 3\/4\" 4-cycle clutch.\u003c\/p\u003e\n\u003ch4\u003eCan I choose colors?\u003c\/h4\u003e\n\u003cp\u003eYes, optional colors like Black are available for an additional fee.\u003c\/p\u003e","brand":"Viper","offers":[{"title":"Black","offer_id":53244373008702,"sku":"FCDC-1DBlack","price":276.68,"currency_code":"USD","in_stock":true},{"title":"Blue","offer_id":53244373041470,"sku":"FCDC-1DBlue","price":276.68,"currency_code":"USD","in_stock":true},{"title":"Red","offer_id":53244373074238,"sku":"FCDC-1DRed","price":276.68,"currency_code":"USD","in_stock":true},{"title":"Silver","offer_id":53244373107006,"sku":"FCDC-1DSilver","price":276.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/3_4__Viper_6-Spring_Clutch_without_driver_1-Disc_--_Choose_OPTIONAL_Colors_If_Desired.jpg?v=1774899546"},{"product_id":"viper-3-4-6-spring-2-disc-vented-blue-clutch-no-driver","title":"Viper 3\/4\" 6-Spring 2-Disc Vented Blue Clutch - Driverless for 4-Cycle Kart Engines","description":"\u003ch2\u003eHigh-Performance Viper 6-Spring 2-Disc Clutch in Vented Blue\u003c\/h2\u003e\n\u003cp\u003eEngineered for precision and power delivery, this Viper two-disk six-spring clutch stands out with its striking blue anodized finish. Designed specifically for 3\/4\" shaft four-cycle engines, it delivers reliable engagement without the driver included, allowing for tailored racing setups. The vented blue anodized drum promotes efficient heat dissipation during intense track sessions, keeping performance consistent lap after lap.\u003c\/p\u003e\n\u003cp\u003eKey highlights include the blue anodized lever support for enhanced durability and reduced weight, paired with high-quality SMCFD8HP disks and a .095\" floater for smooth operation and optimal friction. This clutch excludes the sprocket, giving builders flexibility to match their drivetrain perfectly. Ideal for competitive karting where every component counts toward faster times and better control.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTwo-disk configuration maximizes torque handling\u003c\/li\u003e\n\u003cli\u003eSix-spring setup ensures progressive engagement\u003c\/li\u003e\n\u003cli\u003eVented design reduces overheating risks\u003c\/li\u003e\n\u003cli\u003ePerfect fit for 3\/4\" four-cycle shafts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhether you're prepping for club races or regional events, this clutch provides the grip and responsiveness needed to push limits. Its robust construction withstands demanding conditions while the eye-catching blue accents add a professional touch to your kart's driveline.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch4\u003eWhat engines does this clutch fit?\u003c\/h4\u003e\n\u003cp\u003eFits 3\/4\" shaft four-cycle engines.\u003c\/p\u003e\n\u003ch4\u003eDoes it include a sprocket or driver?\u003c\/h4\u003e\n\u003cp\u003eNo, sprocket and driver are not included.\u003c\/p\u003e\n\u003ch4\u003eWhat disks and floater are shipped?\u003c\/h4\u003e\n\u003cp\u003eShips with SMCFD8HP disks and .095\" floater.\u003c\/p\u003e\n\u003ch4\u003eWhat are the main features of the drum and support?\u003c\/h4\u003e\n\u003cp\u003eBlue anodized vented drum and blue anodized lever support.\u003c\/p\u003e","brand":"Viper","offers":[{"title":"Default Title","offer_id":53244377039166,"sku":"FCDC-VBLUE2D","price":317.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/3_4__Viper_6-Spring_Clutch_without_driver_2-Disc_VENTED_BLUE.jpg?v=1774899605"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/collections\/3_4__Viper_6-Spring_Clutch_without_driver_1-Disc_--_Choose_OPTIONAL_Colors_If_Desired.jpg?v=1788978572","url":"https:\/\/swiftkarting.com\/collections\/viper-assembled-6-spring-kart-clutches-3-4-bore.oembed","provider":"Swift Karting","version":"1.0","type":"link"}