Its dying on me???

So I just rebuilt the top end on my yz250 (two-stroke). I took it out this weekend and everything started fine it ran great until I entered the high end of the powerband and all of a sudden it just died. Its like the electrical or plug just would quit firing because as soon as the bike would stop I would kick it and it would start up fine. So I ran the bike all day just as the powerband would hit. I took the carb apart to see if anything was stuck or loose and that part of the bike is fine. Any suggestions before I tear the whole thing apart. I'm guessing its the plug or electrical.

Thanks

it's hard to fix something through the computer so i can only advise. go back over what you did when replacing the top end. sounds like the power valve may not be assembled correctly.

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