| Listed in parts books | Not catalogued by year yet |
PISTONS BSA A10 8.25 +050
BSA A10 piston, .050 in. oversize, 8.25 compression ratio.
This is a piston for the BSA A10 twin, listed at .050 in. oversize with an 8.25 compression ratio. The manufacturer tag in our system says Amal, but Amal only makes carburetors — this is a piston, and the description is clear that it's built for the A10, so treat that tag as a mistake in our records rather than anything meaningful about who actually makes it.
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We don't have much more detail on file for this one beyond the basic listing. If you're rebuilding a BSA A10 top end and need a .050 oversize piston at this compression ratio, this is the part number to ask about, but call the shop first so we can confirm bore size and ring fitment against what your cylinders actually need before you order.
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