ok,i have one of these big cats on a plane i bought,that is giving me fits. i am missing an honest 1000-1200rpm. the engine has been taken apart and cleaned,inspected,reassembled,great compression,anyway,before and now the engine still won't turn the upper rpm it should.i am running byron's ST 10%/15%oil fuel,an o.s. type "f" plug,and i am only getting it to turn a T/F power point 18x8 6800-7000 rpm,and it turns a 20x6 zinger pro exactly the same rpm. do these need a substantialy larger fuel line and a drilled out clunk in the tank?or am i doing something wrong? i have the needles set to where it has a great 1400-1600 idle and raps up from idle to 6800-7000 in the blink of an eye. i can even let it idle for a couple of minutes,and hit it wide open and it has almost instant throttle response. so what gives? any ideas? thanks.