This 4" stroke 7-7/8" diameter lightened and knife edged flywheel assembly replaces the original flywheels in S&S® 100" SB100 engines for 1986–’03 Harley-Davidson® Sportster® and 1994–’02 Buell® models. Balanced to S&S® 4" bore pistons. Pinion shaft is 1/2" longer than stock to accomodate the extra width of the S&S® Special Application crankcases used in S&S® SB-Series engines.
Flywheels are CNC machined from heat-treated, closed die, steel forgings, and are stronger than cast iron or late style steel flywheels. Dynamically balanced and fully assembled with premium quaility S&S® mainshafts and 7.113" S&S® Supreme connecting rods.