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| Listed in parts books | Not catalogued by year yet |
PISTON,BSA M20 +.040
Piston for the BSA M20, +.040 oversize.
PN · JRC M20/040
Available in 2 sizes (rebore oversizes):
+.020+.040
This is a piston for the BSA M20, machined to +.040 oversize. The M20 is a BSA model, not a Triumph, so if you're working on a Triumph twin this one isn't for your engine — it's for the BSA side-valve single that carries the M20 designation.
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