| Also known as | R1035.020 |
| Listed in parts books | Not catalogued by year yet |
PISTONS AJS TWIN 9:1 +020
An AJS twin piston, 020 oversize, 9:1 compression — not a Triumph part.
This one isn't a Triumph part, so let's be straight about that up front. The catalog description on this number points to an AJS twin piston, sized 020 over standard and built for a 9:1 compression ratio. We carry it because parts numbering and supply lines cross over between British marques more than folks expect, but if you're wrenching on a Triumph, this piston has no business in your engine.
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We don't have much more detail on file for this one beyond what's printed on the part itself. No fitment notes, no bore diameter, nothing about ring packs or pin sizing beyond the oversize and compression figures already given.
If you've got an AJS twin and you're chasing an 020 overbore piston at 9:1, this is worth a call to the shop to confirm it matches what your barrels need before you order. We'd rather talk it through than have it come back.
Sorry if we got something wrong here. If you think this information isn't correct, .