| Also known as | R1035.030 |
| Listed in parts books | Not catalogued by year yet |
PISTONS AJS TWIN 9:1 +030
A 9:1 compression, plus 030 oversize piston for the AJS twin engine, not a Triumph part.
This is a piston listed for the AJS twin engine, sized at plus 030 oversize with a 9:1 compression ratio. It is not a Triumph part - AJS built their own twins, separate from anything in the Triumph unit or pre-unit line, so this one belongs on the AJS side of the shop rather than in a Bonneville or TR6 rebuild.
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The plus 030 marking means it is machined for a cylinder bore that has already been taken out to that oversize during a rebore, and the 9:1 figure tells you the compression it is meant to run. Beyond that we do not have much more detail on this one in our records.
If you are matching this up to a rebuild, give us a call with your bore spec and engine details before you order so we can confirm it is the right piston for what you are doing.
Sorry if we got something wrong here. If you think this information isn't correct, .