75 CB750 rotor anomaly or ?

[Ktom1978]

I just got a CB750 unstuck . It wasn’t stuck all that much . I put a concoction of volitale chemicals in the cylinder and turned the rotor with a pipe wrench.
The mystery ( to me as I’ve never unstuck a cb750 ) The rotor turns freely on the crank counter clockwise but not clockwise ( with pipe wrench or big plies on outside of rotor ). What would be the reason for this. At first I thought I might have sheered a key or something but if that was the case it would rotate freely clockwise. ( I tried not to turn clockwise much because the engine rotates normally counter clockwise. )
Any answers or am I hallucinating ? ( entirely possible after breathing acetone )

 

[dirtdigger]

There is not a key. It is a smooth taper. I would say it wasnt tight enough and it has spun at some point....guess it is galled in a way that it only grips in one direction. I assume you are on the rotor and not the gear?

 

[Ktom1978]

Yes, the rotor that rotates in the alternator.
I guess when I used a pipe wrench on it to get the engine unstuck it loosened ? It is bizarre that it won’t go the other way at all.

 

[Ktom1978]

I guess I need to pull it off and lap it or something

 

[Ktom1978]

Or maybe just tighten the bolt some more but I never loosened it ?

 

[brettp]

If a valve shim popped out of the bucket, the cam lobe will lodge itself in the bucket instead of riding on the shim. Have you looked at the valve train?

 

[dirtdigger]

no shims or buckets on a sohc motor

 

[Ktom1978]

It kicks over fine. No obstruction or rough spots but I need to pull the alternator off again and check the rotor bolt