| Diagram | Fig. 2 — CYLINDER AND CRANKSHAFT · ref 23 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970 |
BSA Crankpin
A BSA crankpin for the crankshaft assembly, tied to the B44 single in catalog records.
This is a crankpin, the shaft that the connecting rod rides on where it joins the two flywheels together inside the crankcase. It's a core piece of the crankshaft assembly, sitting under the CYLINDER AND CRANKSHAFT heading in the parts book, and it's specific to the bottom end it was built for.
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The catalog listing for this one points to BSA, and a related listing elsewhere ties this same crankpin to the B44 single. Our records show it appearing across catalog entries from 1969 to 1970. If you're rebuilding a bottom end, this is not a part to guess on - crankpins are matched to specific flywheel and rod setups, so confirm what you've got on the bench before ordering.
We don't have more detail on this one beyond what's above. Give the shop a call and we'll help confirm fitment before you order.
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