S&S Cycle 07-17 BT 4-3/8in Stroke Flywheel Assembly w/ Sprocket Shaft Bearing Race

Starting with a 4-3/8 inch stroke and an 8-1/2 inch diameter, this S&S Cycle flywheel assembly is built from heat-treated, closed die steel forgings that are 114 percent stronger than stock steel flywheels. This robust construction is crucial for handling the increased stresses of a performance engine build, especially when aiming for higher RPMs. The assembly is fully balanced and trued to less than .0005" runout on the pinion and sprocket shaft bearing surfaces, ensuring smooth operation and compatibility with gear-drive cams.

This flywheel assembly is designed as a direct replacement for the original flywheels in 2007-2016 Harley-Davidson Big Twin engines, and it works with stock pistons. The connecting rods feature full-width wrist pin ends, similar to stock, and the sprocket shaft comes with the bearing race already pressed on, ready to accept a stock roller sprocket shaft bearing. The design minimizes joints, with the only connections being where the 1.671" diameter connecting rod crankpin is pressed into the flywheels, contributing to its overall strength and reliability. This makes it a solid option for builders looking to upgrade their drivetrain for improved performance and durability.

This flywheel assembly fits a wide range of Harley-Davidson models, including popular bikes like the Road King, Street Glide, and Fat Boy, across various years from 2006 through 2017. When undertaking a significant engine build like this, it's always a good idea to consult the manufacturer's installation instructions for specific details and any additional components you might need.