| Also known as | B85 |
| Listed in parts books | Not catalogued by year yet |
BSA VALVE GUIDE EXHAUST B33/4
Exhaust valve guide for the BSA B33/B34 single, listed under 65-1516 (alias B85).
This is an exhaust valve guide listed for the BSA B33/B34 models, not a Triumph part despite whatever bin it landed in around the shop. The B33 and B34 were BSA's big single-cylinder machines, and this guide is the one that seats the exhaust valve stem in the cylinder head, keeping it aligned as it opens and closes.
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Our record on this one is thin. We know it by the number 65-1516 and by the older alias B85, and that's about the extent of what the catalog tells us. If you're rebuilding a B33 or B34 head, this is worth checking against your existing guide before you order, since we don't have dimensions or material specs on file to confirm the match.
Call the shop if you want us to talk through fitment before you commit to buying.
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