S&S Cycle 2007+ BT 4-1/8in Stroke Flywheel Assembly w/o Sprocket Shaft Bearing Race

If you're rebuilding the heart of your 2007 or later Harley-Davidson Big Twin engine, or an S&S T111, this flywheel assembly is a solid choice for a high-performance build. This assembly features a 4-1/8 inch stroke and an 8-1/2 inch diameter, designed to work with crankcases that use a Timken sprocket shaft bearing. It's important to note that this assembly is intended for use when not utilizing stock pistons, and the connecting rods have full-width wrist pin ends.

What sets this assembly apart is its robust construction and precision balancing. The flywheels are CNC machined from heat-treated, closed die steel forgings, making them significantly stronger than stock steel flywheels. They are trued to within .0005 inches of runout on the pinion and sprocket shaft bearing surfaces, which is crucial for achieving higher RPMs and ensures full compatibility with gear drive cams. This assembly comes fully put together with S&S heavy-duty 7.659 inch connecting rods, featuring tapered wrist pin ends, and is dynamically balanced for smooth operation. The design minimizes joints, with the only connections being where the 1.671 inch diameter connecting rod crankpin is pressed into the flywheels, and the pinion and sprocket shafts are forged as part of the flywheel itself, creating a strong three-piece unit.

This flywheel assembly is a significant upgrade for those looking to push their engine's performance. Please be aware that this part is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.