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1/4 missing spitting spuddering RMZ450 06

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I got a 2006 RMZ450, new valves, springs, piston, ( wiseco ) and new wiseco crank. At 1/4 throttle it spits and spudders, coughs, hesitates really bad. It just works bad at 1/4 throttle only. Clean air filter, adjusted pilot jet, then rejetted up. No exhaust leaks, no intake leaks. Only at 1/4 throttle, can be coming on to it and it missing bad, but once over 1/4 it runs great. under 1/4 works great too. Can be going along in 4th up a dirt road if you hold at 1/4 throttle it just misses really bad. Doesn't back fire when it misses. Can someone help me?

Thanks

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