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Discussion in 'Introduce Yourself' started by Robert T Spurlock, Oct 31, 2019.

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How do I fix locked up motor

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  1. Robert T Spurlock

    Robert T Spurlock New Member

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    Hi I received my new 80cc china girl about 3 weeks ago and been finding flaws in the kit set up the chain master link catching the cheap plastic roller on the tensioner and popping off, a spring loaded tensioner with a metal gear should be the fix and I eliminated the master link looking for a tensioner and gear. But now my problem is while riding the bike started vibrating bad the the motor shut off instantly and a link in the chain snapped. I fixed the chain and get the bike going but still vibrating and stalled and did that a few times then the motor locked up let of the clutch and the back tire skids. Now I took out the spark plug and tried turning crank with ratchet and the motor wouldnt budge forward so I tried to turn it backwards and it moved and it blew my brothers thumb off of spark plug hole big time. Can a clogged muffler baffle cause that super compression and lock the motor?
     
    #1 Robert T Spurlock, Oct 31, 2019
    Last edited: Nov 7, 2019
  2. Greg58

    Greg58 Well-Known Member

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    Sounds like a piston or ring broke, I would pull the head and lower the piston to the bottom and look for scratches or plating missing from the cylinder wall. You can reuse the head gasket, just torque the nuts to 12 foot pounds when you put the head back on.
     
  3. Greg58

    Greg58 Well-Known Member

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    If your chain is catching on the tensioner wheel you need to bend or twist the tensioner arm so the wheel runs parallel with sprocket. I've had to tweak everyone I've used.
     
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  4. Robert T Spurlock

    Robert T Spurlock New Member

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    I tried that and things worked fine after eliminated the master link until it all the sudden shut off while in full throttle and a chain link busted which also ruined the idler and roller. I'm waiting on a new spring loaded tensioner with a sprocket and new cdi to arrive.
     
  5. Greg58

    Greg58 Well-Known Member

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    Did you find what locked up the engine?
     
  6. Robert T Spurlock

    Robert T Spurlock New Member

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    No but when I got it unstuck and started it it had tremendous power and pulled the chain off the back sprocket but it kept running till I shut it off. I bought a thunder cdi in hope that it may be the problem, but I'm gonna take the acorn nuts off the head and replace and tighten cause I noticed some oil dowat the bottom of the case. I will look at the piston and rings also , just waiting till the parts are delivered cause the bike is at my brothers muffler shop.
     
  7. Greg58

    Greg58 Well-Known Member

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    CDI is not the problem, it can not lock up the engine.
     
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  8. indian22

    indian22 Well-Known Member

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    Chain didn't come off due to tremendous power but ratherpoor installation and alignment of chain line. Engine, wheel/sprocket cocked at an angle or tensioner lateral adjustment off....perhaps chain tension too tight or too loose. one some are all of these will throw or even break a chain. These are just some of the reasons a chain can come off the sprockets, but bottom line is you've got to figure this out!

    Rick C.
     
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  9. Robert T Spurlock

    Robert T Spurlock New Member

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    Waiting on a spring tensioner in the mail one with a sprocket
     

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