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Help! Where should I start?

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My '05 CRF450X has an aftermarket Procircuit TI header and silencer. When the bike is warmed up if I crank the throttle fast the engine will cut out, turning the throttle slowly will let the bike accelerate normally, and also when engine braking it backfires like crazy. Where should I start? Would you recommend changing to a different jet other than the stock? Thanks for any help you guys can give.

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Thanks man- adjusting the pilot screw about 1 turn out makes it run like a top. No hesitation, no more backfire.

THANKS!!

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