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Klx250 miss at 7000 rpm

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Hello all, my new to me 2007 klx250 loses power/misses starting at about 7000 rpm. It has 1300+ miles on it and a powercore 4 exhaust. I have not had a chance to open up the airbox and see if anything has been done since its been so cold here. I'm at about 6800 ft elev. Any thoughts on where to start. I'm not new to riding but am new to working on bikes, (my xr4 never needed anything lol) thanks....

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Do a plug chop and see if the carb jetting is in the ball park. Might be the old owner put the exhaust on with out jets. Would explain the low miles.

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