| Also known as | GAN52 |
| Listed in parts books | Not catalogued by year yet |
PISTON BSA B50 +.020
A +.020 oversize piston for the BSA B50 single, also known by the older reference number GAN52.
This is a piston for the BSA B50, machined to the +.020 oversize for a rebore. It carries the number GAN52 in older reference material, which is the same physical part as JRC BSAB50/020.
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BSA is not a Triumph model, so if you're working on a Triumph engine this one isn't for you — it's specific to the B50 single. Beyond that, our record on this part is brief, so if you need details on ring pack, pin size, or crown shape, give us a call and we'll confirm before you order.
Worth checking your cylinder's actual bore before ordering an oversize piston like this one — a +.020 rebore is a specific machining step and the piston needs to match what your cylinder was actually taken out to.
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