| Also known as | B133A |
| Listed in parts books | Not catalogued by year yet |
BSA IN-VALVE B40 1960-65
Intake valve for the BSA B40, 1960-65, also listed under the older B133A number.
This is an intake valve for the BSA B40, a part that has nothing to do with any Triumph model despite where it might turn up in a mixed parts bin. The catalog record ties it to the B40 across the 1960-65 span, and it also carries the older B133A designation if you're working from an earlier parts book.
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An intake valve does the basic job any poppet valve does: it opens to let the fuel/air charge into the cylinder on the intake stroke and seals shut the rest of the time to keep compression where it belongs. Wear here shows up as poor starting, weak compression, or valve noise, so if you're rebuilding a B40 top end this is a part worth checking closely rather than assuming it's still true.
We don't have much more written down on this one beyond the model and year tie. If you're not certain which years or which B40 variant your engine falls into, call the shop and we'll confirm fitment before you order.
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