The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: ADP91 on 05.04. 2015 22:23

Title: A10 crankshaft specs question
Post by: ADP91 on 05.04. 2015 22:23

I have two BSA crankshafts and I am unsure whether or not they are A10 or A65 crankshafts. Could someone please provide the A10 crankshaft specs so I can discern what motor these shafts belong to?

Cheers

Title: Re: A10 crankshaft specs question
Post by: trevinoz on 05.04. 2015 22:25

The A65 has a larger timing side main journal for a start. About 1.5".

Title: Re: A10 crankshaft specs question
Post by: Brian on 06.04. 2015 07:04

The A65 was fitted with an alternater so has a different drive side shaft to the A10.

I've added a pic of both types, the one with the spline running to the threaded section is A10. The one with the stepped down section with the keyway is A65.

There was a A10 model with a alternater but it is unlikely you have one of those cranks.

Title: Re: A10 crankshaft specs question
Post by: duTch on 06.04. 2015 08:52

 

Quote

There was a A10 model with a alternator but it is unlikely you have one of those cranks.

 ..but they do have to turn up, but were they only on the Law enforcement agency models in Commonwealth countries..??

 Anyway, if you do have one that has a alternator section, it's worth checking the throw of the crank, A10 is 84mm, A65 is ¿sixty-something?.....never know, you may get 'lucky'- mind you a A10 alternator setup could be a whole other can-o'-worms...... *conf*