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Thread: 75 cb750

  1. #1
    CB750 Member mrbobaz1's Avatar
    Join Date
    May 2018
    Location
    Arizona
    Posts
    6

    75 cb750

    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?

  2. #2
    Moderator dirtdigger's Avatar
    Join Date
    Feb 2012
    Location
    Black Hawk SD
    Posts
    2,650
    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.

  3. #3
    CB750 Member Stubro's Avatar
    Join Date
    Jun 2018
    Location
    NH
    Posts
    5
    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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