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'03 CR125 hesitates to get into powerband

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I have a 2003 CR125 that has been sitting for a year because it took me forever to get around to fixing the front rim on it. I finally got it ready to run. Everything is all good except it hesitates to get into the powerband. It will not accelerate for maybe 2-5 seconds no matter how much gas I give it in 4th or 5th gear right before the powerband. After those 2-5 seconds it will take off and I can keep it in the powerband as it normally would. I took out the plug and it was nice and brown. Could it be that the old gas gummed up the powervalve? I've ran about 3 tanks of 93 octane w/ amsoil interceptor in 40:1 ratio and the hesitation has been reduced, but not eliminated. Does it sound like I should clean out the powervalve? I've never done this before so if anyone could give me some tips that would be helpful.

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Pilot jet clogged up. They are very had to clean some times Just buy a new.

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