S&S Cycle 99-06 BT 4-1/8in Stroke Flywheel Assembly w/o Sprocket Shaft Bearing

This is the S&S Cycle 4-1/8 inch stroke flywheel assembly, designed for 1999 through 2006 Harley-Davidson Big Twin engines, excluding 2006 Dyna models. This assembly is a critical component for your engine's bottom end, dictating the stroke length which directly influences displacement and power potential. If you're looking to rebuild or significantly upgrade your engine's internal rotating assembly, a well-built flywheel is the foundation for increased performance.

S&S Cycle is known for producing robust drivetrain components, and this flywheel assembly is no exception. It's built to handle the increased demands of a larger displacement engine. The 4-1/8 inch stroke is a popular choice for builders aiming for a substantial increase in cubic inches over stock, offering a noticeable boost in torque and horsepower. This assembly comes without the sprocket shaft bearing race, allowing you to use your preferred or existing component if it's in good condition, or to source a new one separately. Proper balancing of the flywheel assembly is crucial for engine longevity and smooth operation, especially with a longer stroke, so ensure this is addressed during your build.

When undertaking a project like this, it's important to have all the necessary components. Since this assembly does not include the sprocket shaft bearing race, you'll need to source that separately. Additionally, consider the overall balance of your rotating assembly to ensure optimal performance and prevent excessive vibration. This part is not CARB approved and cannot be shipped to California.