| Also known as | 65-440 |
| Diagram | Fig. 4 — CRANKSHAFT · ref 30 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1972 |
BSA Gudgeon pin
A gudgeon pin (piston pin) connecting the piston to the connecting rod small end.
This is a gudgeon pin, the pin that runs through the piston bosses and the small end of the connecting rod, letting the rod pivot as the piston moves up and down. It's a bottom-end piston part, showing up in the crankshaft and piston sections of the parts books rather than anywhere in the cylinder head or valve gear.
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The catalog record has it listed under 65-0440, with 65-440 as the same part number in the older short form. Our records show it appearing across a handful of catalog entries in the years right around the turn of the 1970s, but we don't have it tied to a specific model here, so if you're matching this to a particular engine, bring us your piston or the old pin so we can confirm it lines up.
A gudgeon pin is a wear item worth checking whenever a piston comes out for inspection — if the bore in the piston boss or the small end bushing shows play, the pin is the first thing to measure. Give us a call and we'll help sort out fitment before you order.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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