S&S Cycle 00-06 BT 4-1/2in Stroke Flywheel Assembly w/ Sprocket Shaft Bearing Race

When you're looking to get more displacement out of your 2000-2006 Big Twin engine, this S&S Cycle 4-1/2 inch stroke flywheel assembly is a solid choice. It comes with the sprocket shaft bearing race, giving you a key component for your engine build. This assembly is designed for engines that have internal balancers, and it works with either stock or S&S cylinder heads. You can use your stock 88" cylinders, boring them out to 3-7/8" to fit S&S pistons, or opt for a pre-fit S&S cylinder and piston kit. The great thing is, since you're using stock cylinders, the engine height stays the same, simplifying the installation process.

This kit is a smart way to increase your engine's displacement without needing extensive machining, beyond fitting the pistons themselves. S&S offers their stroker pistons separately in all standard oversizes, so you can get the exact fit you need. For engines that came with a 95" kit from the factory, you'll just need to ensure the pistons are fitted for the correct oversize. If your bike is fuel injected, you'll need to recalibrate the fuel injection system afterward. S&S highly recommends their VFI modules and closed loop sensor kits for this purpose to ensure optimal performance and drivability.