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hi have a 2001 foreman 450 s . I took the hmf pipe off to put the stock pipe back on for hunting season , no it will not run right at all , sometimes not starting at all . it has a aftermarket 135 jet in it with a k&N airfilter and a dirty4man style snorkel . so CAN ANYPNE EXPLAIN HOW TO SET THE AIR FUEL MIXTURE TO THE RIGHT POSITION SO I CAN RUN THE STOCK PIPE WITHOUT CHANGING THE JET AGAIN ??