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Pilot screw tweeking question

5439 Views 4 Replies 3 Participants Last post by  TRX2fiveO
I just got done putting in a carb kit and uping my jet sizes fron a 122 to a 125 and 38. I set the pilot screw 2 1/2 -2 3/4 out and it would run good but on hard revs it would puff black smoke out do you think this is carb cleaner burning off ? I used a spark plug to tell if it was running rich or lean and think I have it set good but I am still wondering what up any help?
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Pull the airbox lid off and try it.
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