| Listed in parts books | Not catalogued by year yet |
OIL RING,T150 .040
Oil control ring for the Triumph T150 Trident, .040 oversize.
This is an oil control ring for the T150 Trident triple, listed at .040 over standard bore. It's one of the three rings that ride in the piston's ring grooves, and its job is to scrape excess oil off the cylinder wall on the down stroke so it doesn't end up in the combustion chamber.
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The .040 marking means it's sized for a bore that's been machined .040 in. over stock, which is a common step when a cylinder gets bored out to clean up wear or damage. If you're rebuilding a T150 top end and the barrels have already been bored, this is the oversize you'd be looking for rather than a standard-bore ring.
We don't have much more detail on this one beyond what's in the part listing itself. If you're not sure what bore size your barrels have been taken to, best to measure before ordering — give the shop a call if you want to talk it through.
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