B31 Valve Seat Grinding

[Andmaxjar]

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

[STAR TWIN]

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.

[Bess]

Hi,
    Here's an extract from BSA A65 manual, generally the same for all...

Best wishes...

[Andmaxjar]

Hi,
Many thanks for your replies.

Cheers
Andy