The BSA A7-A10 Forum

Technical (topic titles must be descriptive) => A7 & A10 Engine => Topic started by: dodmo on 13.05. 2007 11:57

Title: Frames - what fits in what?
Post by: dodmo on 13.05. 2007 11:57
Anyone who takes a look at my beeza (http://www.a7a10.net/forum/index.php?topic=235.0) will realize it's a custom not a restoration. So I'm looking it over and exploring exactly what I've got my hands on.
Looking at the engine and frame numbers it would appear this is an A7 shooting Star bottom end, with an A10 top end... in a B31 frame?
What I'm mainly wondering is (assuming I'm correctly interpreting the numbers) if this engine frame combination is a straight transplant or has some jiggery-pokery with the engine mounts been required?
At first inspection the mounts look original and unaltered.
These numbers match up with the Vehicle Registration Document.

Engine number - CA7SS 6***
(http://www.images.itmansoftware.net/a7_engno.jpg)

Frame number - CB31 2***
(http://www.images.itmansoftware.net/a7_frmno.jpg)
(I've blurred out the last 3 digits to prevent any misuse.)

Cheers
dodmo
Title: Re: Frames - what fits in what?
Post by: fido on 14.05. 2007 06:59
The only difference between the B31 frame and the A7 frame was the kink in the bottom rail to go round the oil pump on the singles.
Title: Re: Frames - what fits in what?
Post by: dodmo on 14.05. 2007 08:53
The only difference between the B31 frame and the A7 frame was the kink in the bottom rail to go round the oil pump on the singles.

Thats good to know. Thanks fido. How did the Cairn O Mount go?

dodmo
Title: Re: Frames - what fits in what?
Post by: fido on 14.05. 2007 15:22
Despite the bad weather we had a good turnout, at least 110 bikes. I had just fitted my other magneto on the A7 and I'm not sure if it's working properly as I had trouble starting when hot a couple of times. I had it reconditioned by Tony Cooper but I'm starting to have doubts about the standard of workmanship  *sad2*
Title: Re: Frames - what fits in what?
Post by: LJ. on 14.05. 2007 17:01

but I'm starting to have doubts about the standard of workmanship  *sad2*

Fido... Are you really, really sure? I have heard on a number of other forums that this bloke's reputation is rock solid! Would be worth while rechecking.
Title: Re: Frames - what fits in what?
Post by: fido on 15.05. 2007 07:00
I have a spark tester thing that goes between the cap and the plug and flashes when there's a spark. At times there was little or no flashing.......
Title: Re: Frames - what fits in what?
Post by: LJ. on 15.05. 2007 09:04

Hmmmm I dont really know what to suggest... I suppose that if the man is as good as his word then you'll have to let him know about it. Keep us posted.