| Also known as | 70-3610/020 |
| Listed in parts books | Not catalogued by year yet |
Triumph 650 Piston Set 7:1 +.020
7:1 compression, +.020 oversize piston set for the Triumph 650 twin.
This is a piston set for the Triumph 650 twin, machined to a 7:1 compression ratio and sized at +.020 over standard for a rebore. The part number JRC 650/020L also shows up in the books under 70-3610/020, so if your parts list or an old invoice has that number on it, it is the same piston set.
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A 7:1 compression piston is the lower-compression option used on the 650 twins, and the +.020 oversize means your cylinder bores have already been machined out that far to true them up and clean up any wear or scoring. This is not a piston for a stock-bore cylinder.
We don't have more history on this one beyond what's in the listing itself, so if you're not certain your barrels have been bored to +.020, measure before you order. Piston sets like this are matched to a specific bore size, and getting that wrong means a trip back to the machine shop.
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