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Hi I have a 2000 400ex with a rebuilt stock top end, it has a k&n air filter and a stock muffler with all the inside taken out. but i have a problem it ticks but i know thats cuz of the decompressions jamed. but it doesnt idle. ive clearned the carb and i believe its been jeted. but when you start it up hot or cold at a idle it spudders, coffs, and hickups almost like its back firing then just dies. but if you rev it up the bikes fine and runs perfect, please can anyone help me.
Thanks Cody
 
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