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75 cb750

mrbobaz1

CB750 Member
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Good morning, my 750 motor with a socket on the crank moves about 6 inches oneway then sounds like it hits the block and stops. then I can take it back the other way and about 6 inches it sounds like it hit the block again and stops again. what could cause that?
 
Something in the cylinder, skipped timing letting the valves hit the pistons, something floating around in the primary chain or in the transmission, lots of things, pretty much gotta start tearing it down till you find the issue.
 
Might be a cam chain. As dirtdigger said it's remove the motor from the frame and open it up to diagnose. No other way on this. Use the repair manual for steps to do so.
 
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