| Also known as | 67-643, V23 |
| Diagram | Fig. 4 — CRANKSHAFT · ref 19 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1972 |
BSA CRANK NUT A10/A65 L/H TMS
Left-hand thread crankshaft nut for BSA A10/A65 twins.
This is a crankshaft nut for the BSA A10 and A65 twins, and the catalog description marks it as a left-hand thread piece, so it's not something you want to mix up with a standard right-hand nut on the bench. It sits on the crankshaft itself, part of the crankshaft assembly shown in the crankshaft parts book figures.
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The listing carries an old letter-prefix alias, V23, alongside the modern number, so if you're working from an older parts book you may see it referenced that way. Given the left-hand thread, double check what you're pulling before you start turning anything loose.
This one shows up across catalog entries into the early 1970s for the A10/A65 family. If you're not sure which crank nut your engine takes, give us a call before you order.
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