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so i have a 400ex bored out to a 440ex with a stage 3 hot cam and a stage 1 or 2 crank not sure which on it is. Right now i’m running a 172 jet and a 50 jet and the thing backfires like back in Nam. I have the fuel screw turned out to 3 1/4 turn and still nothing. I have an holes in my air box lid and a nitche air filter. What jets would u recommend
