Flywheel Assembly for 1999-'06 Twin Cam 88® and 88B™

The S&S® flywheels for Harley-Davidson® Twin Cam 88®  and Twin Cam 88B™ engines are available as complete assemblies only.

Since the flywheels are pressed together as opposed to the earlier S&S five piece bolt together design, many shops are not equipped or prefer not to assemble and true the flywheels themselves. Replacement parts are available for those builders who wish to rebuild their flywheels themselves, but it is strongly suggested that flywheel assemblies be returned to S&S for service. While an S&S flywheel assembly can be used to replace the stock Harley-Davidson® flywheel assembly, individual S&S flywheel components cannot be used as stock replacement parts to rebuild stock Harley-Davidson® flywheels. The stock crankpin in a Twin Cam 88® or Twin Cam 96™ engine is 1.671" in diameter, while the S&S crankpin diameter is 1.500". S&S engineers decided to use a slightly smaller crankpin in order to allow the use of replaceable bearing races in the lower end of the connecting rods. In addition, the smaller crankpin size reduces the weight of the connecting rods, while avoiding clearance problems often encountered with increased flywheel stroke. Our experience with nitro burning drag race engines has shown that 1.500" diameter crankpins have more than enough strength to handle the most demanding performance applications.

S&S flywheel assemblies for 1999-up big twin engines are designed for use with Timken® style sprocket shaft bearings. They will fit directly in stock Harley-Davidson® 1999-'02 crankcases and in all S&S crankcases for Twin Cam 88® engines with no modifications. S&S does not produce a set of flywheels that is a direct replacement for the 2003 and later big twin engines. Stock 2003 and later engines use the same roller type bearing for the sprocket shaft that is used on the pinion shaft. However, S&S flywheels may be used in 2003 and later engines with the installation of the Harley-Davidson® bearing kit #24004-03A.

These crankcases use a roller type bearing for the sprocket shaft. Verify that the bearing kit contains the 24604-00D or 24607-07 sprocket shaft bearing. Do not use a 24604-00, 24604-00A, 24604-00B or 24604-00C bearing.

S&S 32-2241 is a direct replacement for Harley-Davidson® part number 23971-03.

Note: All reference to H-D® part numbers is for identification purposes only. We in no way are implying that any of S&S Cycle's products are original equipment parts or that they are equivalent to the corresponding H-D® part number shown.