Bob_
CB750 Member
Hello,
I have an 81 cb750c that is giving me starter clutch issues. The Bike is new to me and has about 3.5k miles on it. When I would go to start it I would get a high pitch whirring, with no engagement. After slowing down it would sometimes clunk and then the next time I hit the starter it would catch for 1 second to long enough to start. I bought a rebuild kit and rebuilt the starter clutch and at the time it made a noticeable improvement but did not solve the issue. This was in the summer when it was 70-80 degrees out. Now with the cold in the winter, anywhere from single digits 50 degrees it slips a lot more, basically back to how it was before I rebuilt the starter clutch. Once the bike gets up to temp it engages more reliably and only slips one out of every 5 cranks.
What could be the issue? When I took it apart I didn't see much if any wear on the gears. I saw some post saying that the surface on the gear where the clutch rides could be worn but I find that hard to believe with such low miles.
Oil is also what is recommended in the manual, forget the weight atm but I know its conventional.
Edit: I took the cover off and it is definitely the starter clutch that is slipping, just don't understand why.
I have an 81 cb750c that is giving me starter clutch issues. The Bike is new to me and has about 3.5k miles on it. When I would go to start it I would get a high pitch whirring, with no engagement. After slowing down it would sometimes clunk and then the next time I hit the starter it would catch for 1 second to long enough to start. I bought a rebuild kit and rebuilt the starter clutch and at the time it made a noticeable improvement but did not solve the issue. This was in the summer when it was 70-80 degrees out. Now with the cold in the winter, anywhere from single digits 50 degrees it slips a lot more, basically back to how it was before I rebuilt the starter clutch. Once the bike gets up to temp it engages more reliably and only slips one out of every 5 cranks.
What could be the issue? When I took it apart I didn't see much if any wear on the gears. I saw some post saying that the surface on the gear where the clutch rides could be worn but I find that hard to believe with such low miles.
Oil is also what is recommended in the manual, forget the weight atm but I know its conventional.
Edit: I took the cover off and it is definitely the starter clutch that is slipping, just don't understand why.
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