| Also known as | 67-298 |
| Diagram | Fig. 4 — CRANKSHAFT · ref 27 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1971 |
SMALL END BUSH BSA 650
Small end bush for the connecting rod on BSA 650 twins, where the wrist pin pivots against the piston.
This is the small end bush for the connecting rod on BSA 650 twins, the bearing surface that the wrist pin (gudgeon pin) rides in at the top of the connecting rod where it meets the piston. The catalog description ties it specifically to the BSA 650 line, not any Triumph model, so despite where you might have found this number filed, treat it as a BSA A50/A65 part.
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The small end bush takes the load and rocking motion where the piston pin pivots in the rod, so it wears over time and gets checked whenever a rebuild is underway. Because we don't have more detail on this one beyond the basic listing, if you're matching it to a rod or piston set already on the bench, give us a call and we'll confirm it's the right one before you order.
We don't carry much history on this part number in our own records, so treat this as a straightforward small end bush rather than something with a lot of story behind it — good to have on hand when you're doing top-end work on a BSA 650 twin.
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