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Proper jetting

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Hey everyone I am running MRD exhaust and also have an FCR carb. Love the power that the bike has but it backfires and pops anytime I am decelerating. I bought the bike this way but I am assuming the jetting isn't right or possibly this is just normal with this set up. Can anyone chime in on this and possibly tell me what the jetting should be so I can change it if I need to. I am at 600 ft elevation.

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Ok great it does have an aftermarket fuel screw so it should be pretty painless. Thanks for the help guys.

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On my slant FCR the popping was eliminated after getting the PAJ adjusted properly. 

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