| Listed in parts books | Not catalogued by year yet |
BSA A10 MAIN BUSH .030
BSA A10 crankshaft main bush, machined .030 over standard size.
This is a BSA A10 main bush machined .030 over standard size. The catalog title on this one confirms it's a crankshaft main bush for the A10 engine, sized for a crank or housing that's already been reground or rebored .030 over. It's not a Triumph part, despite where it lives in our system - the description is plain about the application.
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Main bushes like this seat the crankshaft in the crankcase and carry the running clearances that keep the engine turning smoothly under load. Oversize bushes like the .030 version here are for engines that have already had material removed during a rebuild, so check what your crank and cases actually measure before ordering.
We don't have much more detail on this one beyond what's in the description. If you're not certain about the .030 oversize fitting your particular rebuild, call the shop and we'll confirm before you order.
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