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I just got this atv and I had to replace a rocker arm so I bought a new head for it. When I try to start it it made a humming noise so I turned the engine back a little ways then try to start it and it tryed to start but stoped in the same spot so I tryed to turn it by hand and it stops in the same spot can anyone help with what is wrong with it.
 

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I just got this atv and I had to replace a rocker arm so I bought a new head for it. When I try to start it it made a humming noise so I turned the engine back a little ways then try to start it and it tryed to start but stoped in the same spot so I tryed to turn it by hand and it stops in the same spot can anyone help with what is wrong with it.
That's the #1 indicator that the valve timing is off. And if so, by craming the piston into the valves, now you will need to replace not only the inpacted valves, but quite possibily the piston.
 
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