Can anyone tell me the size of the front 2nd to bottom crankcase bolt on the A10. ? thank's
Hi tdc,
As you say bolt I think you are referring to the swinging arm 1960-1962 model part number 42-4470 which passes through the front engine plate. Its 5/16" CEI 3 1/2" long.
Best wishes...
You need a parts book
https://cdn.shopify.com/s/files/1/0717/0717/files/1960-1963-BSA-A7-A10-Parts-Book.pdf?16907127804076069415
and a fastener database
http://www.gregmarsh.com/MC/FastenersList.aspx
The Draganfly parts list will give you the size, great website for references.