The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: nimrod650 on 28.04. 2016 17:44

Title: a65 crank in A10
Post by: nimrod650 on 28.04. 2016 17:44

can an a65 crank be modified for an a10  *????*

Title: Re: a65 crank in A10
Post by: trevinoz on 28.04. 2016 22:06

Probably but you will lose a bit of capacity with the short stroke.
Apparently A10 cranks are used in A65s so the reverse should be possible.

Title: Re: a65 crank in A10
Post by: Brian on 29.04. 2016 07:08

I could be, and probably are, wrong but I seem to recall that a A65 has a larger timing side journal than a A10. The big ends are the same dia in a A65 as a large journal A10 but I think the timing side journal is larger. If it is it might not be possible to put a A65 crank in a A10 without major surgery. Plus there is also the problem of the A65 having a alternater type crank.

If anyone has a A65 manual perhaps they could look up the journal dia.

Title: Re: a65 crank in A10
Post by: duTch on 29.04. 2016 09:15

 Sorry, but seems like a pointless exercise unless you just want to keep something running no matter what; *conf*

Title: Re: a65 crank in A10
Post by: bikerbob on 29.04. 2016 09:51

Brian is correct the A65 manual for 1962-65 gives the sizes as inner 1.500"-1.5005" outer 1.6285"-1.630 width .940"-.960 so they are larger than for the A10 looking at the Haynes manual.

Title: Re: a65 crank in A10
Post by: trevinoz on 30.04. 2016 01:23

The A65 has a different size drive side journal as well but it should be possible, as Brian says, with a bit of surgery.