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bike starts hard??

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Hey ever sence I put the pipe on my bike and messed with the pilot screw on my 400f the bike seems to be way to rich fom 0 to 1/4 throttle. the bike will start then die out. also when u hold the throttle constant the bike revs wayy up and then back down its really jerkey. if you know how to solve this problem let me know thanks


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