S&S Cycle 84-99 BT 4-3/8in Stroke Flywheel Assembly

If you're rebuilding the engine in your 1984-1999 Harley-Davidson Big Twin, especially if you're aiming for a larger displacement like an 117" with an S&S V117, a solid flywheel assembly is crucial. This three-piece unit from S&S Cycle is built to handle the demands of a performance engine, featuring a 4-3/8 inch stroke and an 8-1/2 inch diameter. It's designed to replace your original flywheels, providing a strong foundation for your engine build.

What sets this assembly apart is its construction. The flywheels themselves are CNC machined from heat-treated, closed-die steel forgings. This process makes them significantly stronger than stock steel flywheels, giving you confidence in their durability. The assembly comes fully put together with S&S heavy-duty 7.667" connecting rods, which have full-width wrist pin ends for added strength. The only joints in the entire assembly are where the crankpin is pressed into the flywheels, minimizing potential failure points. Plus, it's dynamically balanced to less than .0005" runout on the pinion and sprocket shaft bearing surfaces, which means it's ready for higher RPM operation without excessive vibration.

When you're putting together a high-performance engine, the details matter. This flywheel assembly is a well-built component that's ready to be the heart of your drivetrain. Keep in mind that this part is not CARB approved and cannot be shipped to California.