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06 crf450x jetting

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ok i put the pipe (FMF Power Core 4) on a 2006 crf450x and changed from a 142 to a 155 my fuel screw is on factory settings got a lil bit of smoke it that ok? and a slight popping when decelerating not bad though, and still stock air filter and it may just be me but about a foot behind the end of the pipe there's a raspy sound like air turbulence or something kinda sounds like its blowing into leaves but as ya no its pretty much aimed up yall ever herd of that? not sure of my elevation i from northwest alabama though starts like a dream though even better than before

any suggestions would be great THANKS:ride:

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