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yz125 kick starter wont go down


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Hello,

Could use some help. I just put a used cylinder and piston in my 2002 yz125.

Started up and let idle then drove it slowly in 1st and 2nd gear. Then it just shut off in about 10 minutes. I tryed to start it. In a couple of kicks the kick starter would not go down. Seems like the piston is getting hung up partially down even with spark plug out. Does anyone know what maybe going on? Thanks-

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First off start by getting a new piston and ring... why would you put a used piston in your bike? Next step would be to check your ring end gap... If its too tight they are prone to seizing as the piston expands and if they are too loose they tend to get caught on exhaust/ intake ports!

Also did you take a good look at your cylinder to make sure its in good shape and true? Might need to send it in to have it replated or sleeved. If its out of round your pretty much screwed!

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