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99 kx250 problems

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Hey, new to thumper talk.. The bike was running fine and when I went from 2nd to 3rd it my a weird sound for about 40 ft and stalled out. Haven't been able to kick it off at all. Only when I pull it off it will smoke and will not stay running. The engine is new, new crank ,bearing, piston, rings, clean carb,air filter,reeds look good, exhaust port looks fine with muffler off. When pulled it will run for about 50 ft..let it set for about 5 min and it run again when pulled for about 50 foot. Oh yeah, compression is at 170 without exhaust on, the ground was off at the bottom of coil, but it get fire, it feels really weird when kicking. Please help, ready to pour gas on it..

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I didn't want to here that, it's a fresh build, I have ran just 1 tank of gas thru it. New sleeve also. When I did pull it off it smoked like train..I'm going to pull it apart but it's so hard to do cause how nice it looks and the thought of the money wasted.

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