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250 4 strk wont rev runs erattic / backfires over 1/4 throttle

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Help....I bought a 250 4 strk with no engine, I pieced together an 05 250f engine, this thing fires right up and idles like a champ, revs ok up to 1/4 throttle then anything over that it , SOUNDS LIKE A REV LIMITER KICKS IN, I have checked the : Timing Marks, had the intake cam re-indexed and welded, exhaust cam is good, loads of compression, new spark plug, checked jetting, disassembled entire carb - cleaned - set up rich, tested stator and crank sensor - resistance ok, reset the timing marks a zillion times, cant figure this one out....Any help would be great...Thanks

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