| Diagram | Fig. 1 — CYLINDER AND CRANKSHAFT · ref 48 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970 |
BSA Flywheel, drive-side
Drive-side flywheel from a BSA crankshaft assembly, part of the crank/cylinder rebuild group.
This is the drive-side flywheel from a BSA crankshaft assembly, showing up in the parts book under the CYLINDER AND CRANKSHAFT figure. It's a BSA part, not a Triumph one, despite living in the same shop that handles Triumph pre-unit, unit, and OIF stock.
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The flywheel is one half of the crank assembly, bolted or pressed to the crankpin along with its opposite-side mate, adding rotating mass to smooth out the power pulses from the engine. Our catalog record on this one is limited to a single listing tied to 1969, so we don't have a broader run of years or model applications to point to.
If you're rebuilding a BSA bottom end and think this is your part, give us a call and we'll go over what engine and crank assembly you've got before you order — the record we have doesn't spell out which specific model this was fitted to.
Sorry if we got something wrong here. If you think this information isn't correct, .