| Also known as | AC512/040 |
| Listed in parts books | Not catalogued by year yet |
RING SET B44+.040 (JAPAN)
Piston ring set for the BSA B44 single, sized at plus .040 over standard bore, made in Japan.
This is a piston ring set for the BSA B44, sized at plus .040 over standard bore. It's a Japanese-made replacement set, not a Triumph part despite how it might turn up cross-referenced in some parts listings. The B44 designation in the description tells you straight off this is BSA territory - one of the B-series singles - so don't try to fit this to a Triumph twin or triple.
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The +.040 marking means this set is ground for a cylinder that's been bored out that extra amount over stock, which typically happens after a rebore to clean up wear or damage. If your barrel hasn't been bored to that spec, this ring set won't seat right, so check your bore measurement before you order.
We don't have much more detail on this one beyond what's in the description. If you're not sure whether your B44 is at +.040, measure first or give us a call and we'll help sort out what you need.
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