- Browse all categories
- Best Picks by Swift Karting: The Essential Pit Tools
-
- Brake Bleeder Kit
- Brake Fittings & Ferrules
- Brake Fluid
-
Brake Hubs
- Brake Line
-
Brake Parts (M.C.P.)
-
Brake Rotors
- Caliper Brackets
- Enginetics Parts
- Euro Brake Pads
- Front Wheel Brakes
- Master Cylinder Caps, Billet
- Quarter Midget Brakes
- Rotor Guards
-
- Alfano Gauges & Accessories
- Hour Meter
-
Mychron Gauges
- Stopwatches
- Tach Bags
- Transponder Holders
-
-
Axle Bearings
- Axle Cassettes
-
Axles & Accessories
-
Bully Clutches
-
Chain
- Chain Breaker Tools
- Clutch Drivers
- Clutch Friction Discs
- Clutch Mounting Bolt Kits
- Clutch Spacers
-
Hilliard Clutches
- Honda GXH50 Kid Kart Clutch
-
Horstman Clutch Parts
- Lock Collars
-
Max-Torque Clutches
-
Nor-Am Clutches
-
Premier Clutches
- SMC Kart Clutches
- Sprocket Guards & Hardware
-
Sprocket Hubs
-
Sprockets
-
Viper Clutches
-
-
-
196cc Clone Engine & Parts
-
212cc Clone / Predator Engine & Parts
- 224cc Clone Engine & Parts
- Air Filters & Pre Filters (1.25")
-
Air Filters & Pre Filters (2-7/16")
- Big Block Clone Accessories
-
Briggs LO206 Engines & Parts (LO206)
- Briggs Quarter Midget Engine and Parts
- Briggs World Formula
- Camshafts
- Carb Cover (2-7/8")
- Carb Manifolds
- Catch Tanks
- Chain Guards & Hardware
- Exhaust Header Wrap
- Exhaust Silencers & Clamps
- Flywheel Screens
- Fuel Filters
- Fuel Line
- Fuel Pumps
-
Fuel Tanks
-
Gaskets (Fel-Pro)
- Honda GXH50 Kid Kart
-
Motor Mounts
-
Oil & Additives
- Pulse Fittings
-
Raptor (Flathead) Parts
- Spark Plug Index Washers
- Spark Plugs (2-Cycle & Honda Kid Kart)
- Throttle Cables & Hardware
- Tillotson Carbs
- Wiseco Pistons
-
- Track Wear, Kart Life Apparel
Briggs & Stratton
Heavy-Duty Flywheel Nut for Raptor (Superseded by 690662)
Heavy-Duty Flywheel Nut for Raptor (Superseded by 690662)
Couldn't load pickup availability
Vibrations test every fastener—this flywheel nut prevails, securing the assembly in Raptor flatheads. SKU: 555038, superseded by 690662.
It maintains balance for even power pulses, indirectly aiding speed by avoiding timing disruptions. Easy torque application keeps installs straightforward.
- Threaded Precision: Matches OEM specs for tight fit.
- Impact Resistant: Withstands track stresses.
Organize your hardware with this; racers depend on it for worry-free spins.
Frequently Asked Questions
Q: Is this flywheel nut compatible with my Raptor engine?
A: Yes, this heavy-duty nut is specifically designed for Raptor flathead engines to ensure the flywheel assembly remains secure under high-vibration racing conditions.
Q: Why does the description say this part is superseded by 690662?
A: Briggs & Stratton has updated the part number to 690662. While this item (555038) is the original specification, 690662 is the current active part number for the same application.
Q: What is the best way to install this flywheel nut?
A: Ensure the crankshaft threads are clean and free of debris. Apply the manufacturer-recommended torque specifications to ensure the flywheel is seated correctly, which helps maintain balance and prevents timing disruptions during high-RPM operation.
Q: How often should I replace the flywheel nut?
A: It is good practice to inspect the threads and the nut every time the flywheel is removed for engine maintenance. If you notice any signs of stripping, deformation, or wear from vibration, replace it immediately to prevent catastrophic failure on the track.
Related Products From Vendor
- Briggs & Stratton Raptor Flathead 397135 Choke-Style Carburetor - 5HP L-Head - Unrestricted Racing
- Pack of 10 Precision 035 Top Rings for Raptor Engines
- Briggs & Stratton Raptor .015" Top Piston Rings (10-Pack) - Flathead Racing
- Bulk 10-Pack .025" Top Rings for Oversized Raptor Piston Applications
- Briggs & Stratton Raptor .020" Oversize Piston Assembly - 555675 - WKA/IKF Legal
Share
