S&S CYCLE 4-3/8" Stroke Flywheel Assembly W/O Sprocket Shaft Bearing Race For '07-'16 Non-Balanced HD® Big Twins - 320-0351

This 4-3/8" stroke 8-1/2" diameter flywheel assembly replaces the original flywheels 2007-'16 HD^® big twin engines, when using high performance pistons that allow the use of connecting rods with full width wristpin ends. Sprocket shaft does not have the stock style bearing race pressed on. This flywheel assembly is for crankcases with a Timken^® sprocket shaft bearing. 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&S^® heavy duty 7.659" 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.

• 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: Requires S&S pistons; not compatible with stock pistons.
  
  NOTE: Stock pistons in 2007 and later engines require rods with tapered wristpin ends. All S&S® Flywheels for 2007 and later engines have 7.659” length connecting rods. Flywheel assemblies supplied with sprocket shaft bearing race installed are compatible with stock roller style sprocket shaft bearings. Assemblies with no race require a Timken® sprocket shaft bearing

Fitment Guide

Specs