BSA Owners' Club Forum

The BSA Workshop => Singles => Topic started by: Andmaxjar on 09 May, 2017, 23:40:24

Title: B31 Valve Seat Grinding
Post by: Andmaxjar on 09 May, 2017, 23:40:24
Hi All,
Can anyone tell me the a the angle that the valve seat needs to be cut at for a 1949 B31.

Cheers
Andy
Title: Re: B31 Valve Seat Grinding
Post by: STAR TWIN on 10 May, 2017, 06:29:04
Generally 45 degrees would be correct. You can get into all sorts of discussions and complications with what is best - especially in racing circles - but for most road bikes 45 degrees is it.
Title: Re: B31 Valve Seat Grinding
Post by: Bess on 10 May, 2017, 10:37:08
Hi,
    Here's an extract from BSA A65 manual, generally the same for all...

Best wishes...
Title: Re: B31 Valve Seat Grinding
Post by: Andmaxjar on 11 May, 2017, 23:06:36
Hi,
Many thanks for your replies.

Cheers
Andy