hi greg, the original genuine yoshimura gs1000 motors indeed used a smaller shim than the 13mm kawasaki one we typically use nowadays. i think it came out of the the little honda ss800 sports car motor.
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When I saw the pics on page one, I was sure I was looking at aluminum valve spring retainers. That made me cringe. They were notorious for keeper "pull through" back in the day. But slick old Popy used CB750 style keepers machined from titanium (more surface area) to prevent this. Nick is right, the valves were 6.6mm on the original Yoshi motors. Complete article here....Bill
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can you repost that link pls... Or upload the file :-)Comment
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Linky no work now. Might have been this one.....Billy
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