BSA Owners' Club Workshop Discussions

The BSA Workshop => Singles => Topic started by: watts on 06 Jan, 2025, 21:05

Title: B31 Magneto backlash
Post by: watts on 06 Jan, 2025, 21:05
It has been a while since I have had magdyno bike.
I am sure on a previous one there were adjustable studs on the base to set backlash.
It is a 1953 bike.
Mine has no studs and looks it never has or not for many years.

By 1953 were no longer used?

Thanks

Matthew
Title: Re: B31 Magneto backlash
Post by: Bigsingle on 06 Jan, 2025, 22:53
My B33 magdyno was along way off centre , my slots didnt look worn , so I added a tiny amount of weld to the pegs (tig) to allow me to file to suit , it worked out fine . And was alot less than I thought (weld) to correct .  My magdyno base had some wear at the points end  so i added a approx .004" shim across that end  which decreased the backlash .Cheers
Title: Re: B31 Magneto backlash
Post by: watts on 12 Jan, 2025, 23:30
Hello

Thank you.
I give that a go.

Cheers.
Matthew