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Dirt bike stalls after riding on powerband

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i just bought a 2002 YZ 125 2 stroke and i was riding the rev limiter for a second or two and then i let off it and it dies this happened twice and the only way to start it was bump starting it behind a UTV and the third time my brother was coasting it down the driveway and it stalled now it wont start. i have checked the spark plug the air flow made sure there was no air in the system it has gas in the tank but not a lot and the compression is a little low when you kick it over it will backfire every now and then. i dont really know what the problem could be i think it might have to do with the timing 

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Since you mention stalling twice, you might have actually experienced engine seizures.

 

Pull the exhaust pipe off and have a peak at the piston thru the exhaust port.

Shine a flashlight in there to see if there are any deep scratches.  Post some pics.

Edited by mlatour

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6 hours ago, NZracer said:

Pull the top end off. My pick is she's toast.

Agreed. 

Just pull the top end off. Too easy on that bike.  See how bad it is.

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