Dead spot at 1/4 throttle

I just replaced my stock stator with a yamaha brand bigger wr426 stator and flywheel on my 2000 yz426, because I have added tail and head lights and a horn. Now I have a dead spot at about 1/4 throttle. Does anyone have any suggestions or ideas on cause and remedy? I put in fresh gas after the install and replaced the plug.

Nevermind guys its jetting. im gonna order the FMF jet kit and go from there... put a wide band behind her and throw her on the dyno... see what i can do.

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