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hey I need help I have a pop/hangup sound from exhaust when I let off the gas. here is a video to help you understand https://www.youtube.com/watch?v=JYTPJYT4S4E. im running  1/2 turn on air screw, 1 jet size leaner on idle n main. 1 clip leaner on needle then recommended.  pro circuit header an fmf exhaust with fresh spark plug and air filter. I went to stock jets and it still made that sound. Its really boggy down low it wont reach powerband on hills. then hits real fast and real hard its intense. Plug is always black no matter the jetting. PLEASE HELP ME!!

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