Author Topic: B31 Valve Seat Grinding  (Read 304 times)

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Andmaxjar

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B31 Valve Seat Grinding
« 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

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Re: B31 Valve Seat Grinding
« Reply #1 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.

Bess

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Re: B31 Valve Seat Grinding
« Reply #2 on: 10 May, 2017, 10:37:08 »
Hi,
    Here's an extract from BSA A65 manual, generally the same for all...

Best wishes...

Andmaxjar

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Re: B31 Valve Seat Grinding
« Reply #3 on: 11 May, 2017, 23:06:36 »
Hi,
Many thanks for your replies.

Cheers
Andy