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07 rmz450 problems

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Alright. I have a used bike which ran well untill I installed a spark arestor into the exaust. Just curious....It will idol smoothly with the joke on. If I push the choke in the engine dies. If I try to give it throttle with the choke on while it has a smooth idle, the engine backfires. I'm thinking the carb needs to be tuned....not really sure what is going on. Anyone with any thoughts or ideas please let me know.:excuseme:

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You are running lean. Turn the fuel screw out (clockwise) 2 turns.

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