S&S, flywheel set. 4-1/2" stroke

Past op: 55-E81 Big Twin (NU)

Unassembled & unbalanced flywheel set. Flywheels have the stock 8-1/2" diameter and are compatible with the flywheel scrapers found in both stock and S&S crankcases.
Compatible with S&S Sprocket shaft assemblies:
- 512401 55-64 B.T. with S&S SE & SL flywheels only
- 512402 65-69 B.T. with S&S SE & SL flywheels only
- 512403 70-99 B.T. (excl. Twin Cam) with SE & SL flywheels only.
S&S Crankpin assemblies:
512469 Std. 1.249" OD. 41-E81 B.T. Repl. 23961-41.
512471 +.001" 1.250" OD. 41-E81 B.T.
512472 +.002" 1.251" OD. 41-E81 B.T.
S&S Pinion shaft assemblies:
518010 39-53 FL with OEM or S&S E flywheels. Repl. 24007-39.
512404 58-E81 B.T. (See 'Note 1' for 54-57 models).
Note sprocket shaft: OEM sprocket shafts will not fit the 6° taper that S&S flywheels have, apart from 81-85 stock style B.T sprocket shafts (OEM 23909-80 / MCS 502615 and 502616). These will fit S&S flywheels but do not have the keyway that S&S sprockets shafts have. The woodruff key eliminates spinning of the sprocket shaft in the left flywheel.
Note1: 58-81 B. T. pinion shaft assemblies also fit 54-57 B.T. when the stock pressed-in bearing race is removed and the cast-in bearing retainer is bored out to accept the larger 58-81 press-in bearing race (OEM 24599-58B / MCS 518110).
Note: Special Order Product only.
To order please contact your MCS sales representative.