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throttle problems

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i have a 2000 yz 250 that i just rebuilt the carb on and since i put it back together it will idle fine but once you start turning the throttle some it revs up and eventually running wide open like when its out of fuel... ive tried taking the gas cap on and it did a lil better but acted like it wanted to do the same thing.. after looking i noticed the intake boot has a small crack about 1/2 way around it could this be the problem?? i know on the banshee i had the bike would spit and pop when the boot was cracked just never had one act like it was vapor locking..

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