| Listed in parts books | Not catalogued by year yet |
PISTON SET NORTON 750.040
A .040-over piston set for the Norton 750 twin engine.
This is a piston set for the Norton 750 twin, sized at .040 over standard bore. The JRC part number ties it to the 063346/47 reference, so if your parts book lists that number you're looking at the same set.
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A .040 overbore set like this is what a rebuilder reaches for once the original cylinders have been machined out to clean up wear or damage, bringing the bore back to a true round surface and matching it with pistons cut to fit. This is a Norton Commando-family engine part, not a Triumph piece, despite where it might turn up in a mixed inventory.
We don't have more detail on this one beyond the catalog listing. If you're planning a rebuild, call the shop and we'll confirm it's the right oversize and set for your particular cylinders before you order.
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