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Allan G
Total Likes: 1
Original Post (Thread Starter)
#802469 03/23/2020 5:12 PM
by BritBoy
I just finished restoring a 1972 BSA 750 Lightning, A70L. Basically the same bottom end as a A65L.

The timing gears are making a loud whining noise. Louder than I remember hearing from a BSA twin before. Am I remembering wrong? are the timing gears normally loud on these or should I be concerned?
Liked Replies
#802486 Mar 23rd a 06:10 PM
by Rich B
Rich B
Worn intermediate gear bush either in the timing cover or case will cause a whine. Misaligned bushes on the intermediate gear will cause a similar noise.
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