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Just getting back into dirtbiking, and bought an 08 250sx. Love it, but the last 2 times I was out my bike died. First time I got home, changed the spark plug and she ran great. Got 1/2 hour into the next ride a couple weeks later and she died again as if it was out of gas, just bogged out and died, no chance of kick starting. Any ideas. Much appreciated.
 

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Not sure if I'll be any help but a friend had an older WR250 2 stroke and he was having similar issues we tried differant heat range of plug differant fuel new coil etc. and it turned out being the cylinder/piston it kept fouling the plug. Is the bike new or did you buy it used? Good luck
 

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Is the gas/oil fresh?

Smokey exhaust?

What did the old plug look like?
 
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