Bruce Drapeau
CB750 New member
Picked this bike up in 2015 and haven't had time to get at it till this year. License plate on it is from 1989. Replaced four bent valves, ground all valves and seats, re-shimmed, all valves, reassembled and installed engine, and did cranking compression check. (145ish all 4)... Front brakes calipers froze , return port in master cylinder plugged , still has original exhaust and in very nice shape... etc. Had carbs off three times, last time disassembled rack installed all new fuel tube o-rings plus everything that couldn't be installed with carb rack together. Started bike and it sounded almost perfect,.. did carb synchronization, and idle mixture procedure. seemed to run Perfect.
Time for test ride.....everything went good until it warmed up with a load and Idle was hanging about 2500-3000 rpm. I have done every check in this forum, (that I could find) except spaying throttle shafts with flammable carb cleaner to check for vacuum leak. I did run a wire through the Pilot jets when putting rebuild kit in, but I did not remove them. If nothing concise on throttle shafts found., Next step is to remove carb rack and pull pilot jets.
Evidently I am missing something?? Any input would be appreciated.
Time for test ride.....everything went good until it warmed up with a load and Idle was hanging about 2500-3000 rpm. I have done every check in this forum, (that I could find) except spaying throttle shafts with flammable carb cleaner to check for vacuum leak. I did run a wire through the Pilot jets when putting rebuild kit in, but I did not remove them. If nothing concise on throttle shafts found., Next step is to remove carb rack and pull pilot jets.
Evidently I am missing something?? Any input would be appreciated.
Last edited:
