S&S, unassembled crankshaft. 3-31/32" stroke

Unassembled and unbalanced flywheel assembly. The flywheels have the original 8-1/2" diameter and are compatible with the flywheel scrapers found in both original crankcases and S&S crankcases.
Compatible with S&S pinion shaft assemblies:
- 512401 55-64 B.T. only with S&S SE & SL flywheels - 512402 65-69 B.T. only with S&S SE & SL flywheels - 512403 70-99 B.T. (excl. Twin Cam) only with SE & SL flywheels.
S&S conrod assemblies:
512469 Standard 1.249" OD. 41-E81 B.T. Replaces 23961-41.
512471 +.001" 1.250" OD. 41-E81 B.T.
512472 +.002" 1.251" OD. 41-E81 B.T.
S&S sprocket shaft assemblies:
518010 39-53 FL with OEM or S&S E flywheels. Replaces 24007-39.
512404 58-E81 B.T. (See 'Note 1' for 54-57 models).
Note on pinion shaft: OEM pinion shafts do not fit the 6° taper of S&S flywheels, except stock-style B.T. 81-85 pinion shafts (OEM 23909-80 / MCS 502615 and 502616). These fit S&S flywheels but do not have the keyway groove found on S&S pinion shafts. The Woodruff key prevents the pinion shaft from rotating in the left flywheel.
Note 1: The 58-81 B.T. pinion shaft assemblies also fit 54-57 B.T. models when the original pressed-in bearing bushing is removed and the cast bearing retainer is bored out to accept the larger 58-81 pressed-in bearing bushing (OEM 24599-58B / MCS 518110).
Note: Product available on special order only.
To order, contact your MCS sales representative.


Specifications


Brand
S&S


Application
55-E81 Big Twin (NU)


OEM
23961-41, 24007-39, 23909-80, 24599-58B


Packaging weight
0 kg


HS Code
87141090


Motorcycle family
BIG TWIN, FX, TOURING


Original name
S&S, unassembled flywheel set. 3-31/32" stroke