| Diagram | Fig. 1 — CYLINDER AND CRANKSHAFT · ref 68 |
| Subsystem | engine bottom |
| Listed in parts books | 1969 |
BSA Outer valve spring
An outer valve spring, part 40-1009, listed in the cylinder and crankshaft section with a single 1969 catalog appearance.
This is an outer valve spring, catalog part 40-1009. The parts book lists it under the cylinder and crankshaft section, and the tag on it in our records points to BSA rather than Triumph, so before you order, double check which machine you're working on. Outer valve springs work alongside the inner spring to close the valve after the cam pushes it open, and they're a common wear item to check when you've got the head off for any kind of top-end work.
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Our catalog record only shows this part turning up once, tied to 1969, so we don't have a broad fitment history to lean on here. If you can tell us the model and engine you're rebuilding, we can confirm whether this is the right spring before it goes in the mail.
Given how thin the record is on this one, treat it as a starting point for a conversation rather than a confirmed fit. Call the shop with your engine details and we'll sort out fitment together.
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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