| Also known as | B161 |
| Listed in parts books | Not catalogued by year yet |
PISTON KIT BSA A50 +.040
A +.040 oversize piston kit for the BSA A50 twin.
This is a piston kit for the BSA A50, sized at +.040 over standard bore. It's listed in our system under the number JRCBSAA50/040, with B161 showing up as an older alternate number for the same kit.
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This is a BSA part, not a Triumph part, so if you're working on a Triumph twin this one isn't for you. The +.040 oversize tells you this kit is meant for a cylinder that's already been bored out that far, typically during a rebore job when the original bore has worn past cleaning up at a smaller size.
We don't have much more detail on file for this one beyond the description itself. If you're not sure whether your barrel has already been bored to +.040 or some other size, give us a call before you order so we can help make sure it's the right kit for your rebuild.
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