| Also known as | AA42A |
| Diagram | Fig. 2 — CYLINDER AND CRANKSHAFT · ref 22 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970 |
BSA WRIST PIN B40 B44
Wrist pin (piston pin) for BSA B40 and B44 models, part number 41-0101.
This is the wrist pin (piston pin) for the BSA B40 and B44 models, listed here under part number 41-0101, with the older factory form AA42A also on record for the same piece. It's cataloged in the CYLINDER AND CRANKSHAFT section of the parts books, which is where you'd expect a piston pin to live since it's the pin that joins the piston to the connecting rod small end.
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This is a BSA part, not a Triumph part, despite showing up in a Triumph-oriented parts catalog — the description names the B40 and B44 models directly, and those are BSA singles. Catalog appearances run 1969-1970.
If you're rebuilding a B40 or B44 top end, this is one of the pieces to check for wear alongside the piston and circlips. Give us a call if you want us to confirm fitment before you order.
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