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Topics - Dave1

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Twins / Differences between A65 engines?
« on: 18 March, 2017, 21:52:23 »
So I recently purchased a 1971 BSA A65 Lightning.

The engine in it is a 1965 Lightning rocket ( thanks to Julian on here for helping to identify). The engine needs work, and this has put me in a predicament. Would a 1965 cylinder head work with a 1971 oil in frame? Reason I ask I need to purchase new valve guides, the 1971 cylinder head, had different valve guides from the earlier engines.

Twins / Help with engine number
« on: 18 March, 2017, 17:50:56 »
Hello, I am in the process of becoming a member of the BSAOC. I have recently purchased a 1971 BSA A65 Lightning, which apparently has a Devimead 750 big bore kit.

I am having trouble dating the engine. The engine code is A65D 42*9. * is to not fully reveal the whole engine number. My frame number tells me its a June 1971 bike.


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