S&S® 4" Stroke Flywheel Assembly For 1999-'06 A-MODEL H-D Twin Cam® (Except 2006 Dyna Models) -Full Top Connecting Rod, S&S Part Number 320-0403
S&S® 4" Stroke Flywheel Assembly For 1999-'06 A-MODEL H-D Twin Cam® (Except 2006 Dyna Models) -Full Top Connecting Rod-S&S Part Number 320-0403
This 4-3/8" stroke flywheel assembly replaces the original flywheels 1999-'06 HD® Twin Cam® engines,( accept 2006 dyna models) 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 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 quality S&S® heavy duty 7.659" connecting rods, with full width wrist pin ends, and dynamically balanced. Assembly is trued to less than .0005" run-out on pinion and sprocket shaft bearing surfaces, making them capable of higher rpm and fully compatible with gear drive cams.
*By choosing to add sprocketshaft race converts this flywheel assembly to part # 320-0402.