Question about Honda 2005 TRX 400EX

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2005 trx450r, yoshi pipe, open air box, at higher rpms at cuts out a bit.. my buds stock trx450r is only a inch slower on bottem end, and faster on top end.. last owner said it has a hot cam. i dont beleive that if a stock 450 is right beside me.. just about every time i try to start it, every kick it has a little back fire. even if it starts up on first kick. time to time it spits from the carb and dies.. when i put the air box lid on it will not rev over half throttle.. i just want it to rev fully smooth, without the cutting out.. i no its not the limiter, being his dont do it.. thanks for the help!!

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