S&S Cycle 65-69 BT 4-1/2in Stroke Flywheel Assembly

S&S Cycle is well-known for building high-performance engine components for Harley-Davidson motorcycles. This 4-1/2 inch stroke flywheel assembly is a prime example, designed to replace the original flywheels in specific S&S 93-inch engines for 1965 through 1969 Harley-Davidson big twins that use generator-style crankcases.

These flywheels are CNC machined from heat-treated, closed die steel forgings, making them notably stronger than original cast iron flywheels or even later-style steel flywheels. This robust construction is crucial for handling the increased stresses of a performance engine. They come fully assembled and dynamically balanced, which is essential for smooth operation and longevity. The assembly includes premium S&S mainshafts and heavy-duty 7.440-inch connecting rods, ensuring a solid drivetrain foundation.

If you're working on a 1965-1969 Big Twin engine and looking to upgrade or replace your flywheels with a stronger, more reliable component, this S&S Cycle assembly is a solid option. It's built to handle the demands of a performance-oriented build.