S&S CYCLE 4-3/8″ Stroke Flywheel Assembly W/Sprocket Shaft Bearing Race For ’03-’06 Internally Balanced HD Big Twins – 320-0354

This 4-3/8″ stroke 8-1/2″ diameter flywheel assembly replaces the original flywheels in 2003-’06 HDinternally balanced big twin engines, increasing the stroke from 4″ to 4-3/8″. Sprocket shaft has a stock style bearing race pressed on for use with stock roller style sprocket shaft bearing. Pinion shaft has sprocket to drive balancer chain. Flywheel assembly is three piece design. Pinion and sprocket shafts are forged as part of the flywheel. The only joints in the assembly are where the 1.671″ diameter connecting rod crankpin is pressed into the flywheels. Flywheels are CNC machined from heat-treated, closed die, steel forgings, which are 114% stronger than late style stock steel flywheels. Fully assembled with premium quaility S&Sheavy duty 7.667″ connecting rods, with full width wrist pin ends, and dynamically balanced. Assembly is trued to less than .0005″ runout on pinion and sprocket shaft bearing surfaces, making them capable of higher rpm and fully compatible with gear drive cams.

• Replacement Flywheel Assemblies for Twin Cam Motors
• S&S 3-piece flywheels with integral main shafts are the strongest yet, made from 4140 steel and feature a larger 1.671″ crankpin
• Flywheel assemblies are designed for use with Timken bearing conversion
• Fits directly in stock crankcases with no modifications
• Made in the U.S.A.

  NOTE:Stock pistons in 2007 and later engines require rods with tapered wristpin ends. All S&S Flywheels for 1999-’06 engines have 7.667 length connecting rods. Flywheel assemblies supplied with sprocket shaft bearing race installed are compatible with stock roller style sprocket shaft bearings.

Fitment Guide

Specs