| Also known as | B184A |
| Diagram | Fig. 7 — GEARBOX AND CASING · ref 1 |
| Listed in parts books | Not catalogued by year yet |
VALVE COTTER B31/33/M33
Valve cotter for BSA B31/33/M33 models, also known by the older B184A number.
This is a valve cotter listed for the B31, B33, and M33 models. Given the model names on the catalog entry, this isn't a Triumph part despite how it's filed in our system — B31, B33, and M33 are BSA designations, not Triumph ones. A valve cotter is the small collet-style piece that locks the valve spring retainer onto the valve stem, working together with the split collets to keep spring tension seated properly.
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Our records on this one are thin — we don't have more detail on it beyond the basic listing and the older B184A number it's also known by. If you're sourcing this for a BSA B31, B33, or M33 rebuild, call the shop and we'll confirm it's the right piece before you order.
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