The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: coater87 on 12.01. 2017 11:38
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Can anyone confirm if part number 67-1401 is 5/16 whitworth thread?
This is the grub screw for the non return ball and spring. I am going to do the conversion to A65 type on this, and it just seemed odd that this would be a whitworth thread.
Another question: I see the A65 and the A10 springs have different part numbers. Looking at the pictures the A65 looks like a stiffer, thicker spring. Which spring is best for this conversion?
Thanks,
Lee