04 Wr450 Problem

just sold my 01wr426 and got my "new to me" 04wr450 home today. starts very easy hot or cold,top end is great and very smooth... but from low end to about 3/4 all it does is miss, surge, and sputter. "BAD"... as far as performance add on the bike has a GYTR full exhaust and a factory JAMES kit. The 450 seems to be very weak against my 01-426 I hope this is only a jetting problem. i am sure that someone out there has had this problem, any help is appreciated


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