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Need help! Sons bike won't start or run

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My son has a jr80 and it all the sudden died on the track. Won't start or run. Tried to kick start and roll off/jump start and it will putter for a brief second and not ever start. He only rides it in 1rst 2nd and sometimes 3rd. Winds it out pretty hard. Bike was a oil inject but someone converted it to mix and took oil tank off.

It has spark and good gas (Or did have). Took head pipe off and looked at piston and rings and they looked a lot better than expected for a 03/04 bike. Compression is at 120ish if I remember correctly. Not the best but should run at that. That's all info I can remember to right now so what could it be?

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