Now I understand the three punch marks on the rear hub of my 5511 sandcast, throttle valves, cush drive rubbers and chain replacement. Other bikes have three punches on the engine pad, I always wondered if it was just a service techs preference.
I didn't see where the punch marks were referenced though, so it may have been an unofficial way to know at a glance if re-calls were already done. It appears my 14,100 would have been recalled in that one also. I never had the original engine case which may have been stamped. It had Lester mags, so the hub was gone also.
It also appears that Honda went to the 17 tooth sprocket early in sandcast production for K0 and the 18 tooth in K1.
We think these were the first and third cb750 sold at our local shop, the guy that assembled them still has the #2 bike.
