S&S Cycle 84-99 BT 4-1/2in Stroke Flywheel Assembly

This S&S Cycle flywheel assembly is built for 1984-1999 Big Twin engines, specifically designed as a replacement for S&S 113" V113 engines. It features a 4-1/2 inch stroke and an 8-1/2 inch diameter, offering a significant increase in displacement and power potential over stock components. If you're looking to rebuild or significantly upgrade the heart of your V-Twin, this assembly is a solid foundation.

These flywheels are CNC machined from heat-treated, closed die steel forgings, making them notably stronger than typical cast iron or even later-style steel flywheels. This robust construction is crucial for handling the increased stresses of a larger displacement engine. They come dynamically balanced and fully assembled with premium S&S mainshafts and heavy-duty 7.440" connecting rods, ensuring smooth operation and durability. The pinion shaft is also 1/4" longer than stock, which is necessary to properly fit the wider S&S Special Application crankcases, ensuring a precise installation.

When undertaking a build of this magnitude, it's important to ensure all components work together. This flywheel assembly is a key piece for those aiming for substantial power gains and a more potent engine. Please note that this part is not CARB approved and cannot be shipped to California.