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05 crf 450 jetting in las vegas

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i just picked up an 05 crf450. its pretty nice. im coming off of a kx500. the honda has a white brothers full system exhaust. carbon fiber muffler. its making popping sounds when decelerating. the guy told me that someone very reputable jetted the bike to the pipe. well, i checked the jetting and its stock ---42 pilot and 168 main. i think maybe this is too little for such a pipe. im thinking of going to a 45 piot and a 172 main. the altitude here in las vegas is 2000 above sea level i think. what do you guys think? any help is greatly appreciated

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hey i live in reno and before i put a cam in it the only jetting i did was one size down on main and my bike ran like a top year round up to even up at tahoe. had fmf mega bomb twin air filter ,scrapped the back fire screen ,plugged the air box engine vent .

if your back firing check for exhaust leaks.

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