GOOD NEWS, the guy that was converting my engine found the problem. as it turned aut there was no balance isssues it was a fuel problem. it seems there was a leak in the intake manifold causing the poor performance. without a muffler and not completely tuned the engine tached 7600 rpm with a zinger 20X10prop. not bad imo so all is well in rc wonderland i appreciate all your help and hope to mount the engine this week and get dimensions for mr.lambert for the muffler. thanks for all your help guys!!!