| Listed in parts books | Not catalogued by year yet |
PISTONS TRI 650 10:1 +040
Piston for the Triumph 650 twin, 10:1 compression, +040 oversize.
This is a piston listed for the 650 twin at a 10:1 compression ratio, in the +040 oversize. The +040 mark tells you it's meant for a cylinder bore that's been machined out 0.040 inch over standard, usually to clean up wear or damage, so it's a fitment you match to the actual bore size on the barrels in front of you, not just the engine family.
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The manufacturer code on file for this one points to Amal, but pistons aren't something Amal made — that tag doesn't match what the part actually is. Go by the description here: a piston for the Triumph 650 twin.
We don't have much more on file for this particular listing beyond the description itself. If you're rebuilding a 650 top end and need to confirm this is the right oversize and compression for your barrels, give us a call and we'll sort out the fitment before you order.
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