BSA Owners' Club Workshop Discussions

The BSA Workshop => Singles => Topic started by: chaz on 04 Feb, 2020, 05:20

Title: B40 1965 swinging arm dimensions
Post by: chaz on 04 Feb, 2020, 05:20
Just pressed in new bushes and honed them. Only to find the two eyes are out of line. Does anyone have a drawing or dimension between the two faces so I can check . A drawing would be good then I can check the two arms positional as they don't look right, thanks
edit,  it's the biggest metal brushed ones not rubber type bushes. Although, I might try to find needle rollers to suit then machine ...
Title: Re: B40 1965 swinging arm dimensions
Post by: Bess on 04 Feb, 2020, 17:13
Hi Chaz,
             I'm not into B40's but I have these if they help:

Best wishes...
Title: Re: B40 1965 swinging arm dimensions
Post by: chaz on 04 Feb, 2020, 18:47
thanks Bess
but this is the isolastic one where the pivot is one long pivot ,ours is the doublle fork style .
your picture goes inside the frame lugs ours the arm pivots on the centre frame boss. 40-4206
Title: Re: B40 1965 swinging arm dimensions
Post by: Bess on 05 Feb, 2020, 11:19
Hi Chaz,
            Service Sheet 710x has the frame and seat section dimensions for a B40. You might be able to work out the dimensions you need from these?

Best wishes...
Title: Re: B40 1965 swinging arm dimensions
Post by: chaz on 05 Feb, 2020, 16:03
Hi Bess
the only dimension I can see is frames only and A group, B group and Gold Star 1954 swinging arm drawing that may be relevent but only gives position of welded plates not the overall dimension. do you have a service sheet number for the one you posted , may be more on the page?
the dimension on the drawing for the B group is 2.500" but our arm has a gap of 4.500".
Title: Re: B40 1965 swinging arm dimensions
Post by: Bess on 05 Feb, 2020, 17:49
Hi Chaz,
            There isn't a page number, its in the Service Sheet No. 710x, frame repairs, all models section. I have attached a copy:

Best wishes...
Title: Re: B40 1965 swinging arm dimensions
Post by: chaz on 05 Feb, 2020, 18:09
Bess
thanks
thats a different 710X service sheet than I have found searching the net , all the rest are frame dimensions or older bikes.
Title: Re: B40 1965 swinging arm dimensions
Post by: Bess on 05 Feb, 2020, 18:27
Hi Chaz,
            You are welcome, hope it helps...