| Also known as | B148 |
| Listed in parts books | Not catalogued by year yet |
PISTON KIT B33 +.020
A +.020 oversize piston kit for the BSA B33 single, also listed under the older B148 number.
This is a piston kit for the BSA B33, machined to the +.020 oversize. The B33 is a BSA single, not a Triumph, so this one's for BSA owners rebuilding that engine rather than anything in our usual Triumph twin lineup. The +.020 designation means it's sized for a cylinder that's already been bored out that amount over standard, which is typically done to clean up wear or damage on a previous rebuild.
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We don't have much more detail on this one beyond the basic listing. It carries an older B148 reference as well, which is worth having on hand if that's the number printed in your parts book.
Before ordering, it's worth double-checking your bore size against this kit's spec, since fitting the wrong oversize piston to a cylinder that hasn't been bored to match won't work. Call the shop if you want to talk through it.
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