| Also known as | 70-3610/040 |
| Listed in parts books | Not catalogued by year yet |
Triumph 650 Piston Set 7:1 +.040
A 7:1 compression, +.040 oversize piston set for the Triumph 650 twin.
This is a piston set for the Triumph 650 twin, built to a 7:1 compression ratio and machined at +.040 over standard bore. It's listed under JRC 650/040L, with 70-3610/040 as the alternate part number for the same set.
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Going +.040 over is one of the standard rebore steps when a 650 top end has worn past the smaller oversizes, and the 7:1 compression figure tells you what kind of running character to expect out of the finished engine compared to higher-compression setups. Since we don't have more detail on this one beyond the set description, check your cylinder bore measurement against this oversize before ordering.
As always with piston sets, match the oversize stamped on the piston to what your barrels have actually been bored to — a rebore shop can confirm before parts get ordered.
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