Hi there! thanks for the information!
Apart for that issue, the power to weight ratio is more than adecuate,this frame as you see in the pictures is very very light,prop hangat 1/2 throttle and goes up like rocket from there, also loops on knife edge,so what you think could be wrong?,I fitted this engine to a showtime 90 before and again it was a plessure to fly,same thing very powerfull,but it was doing the same thing, on a different tank,plumbing,dif frame!.
mmm, Im think will take the carb apart and have a good look just in case,something is sticking, could be the oil Im using?? this amsoil dominator oil states you can use as low as 50:1, Im on 20:1 as the saito manual for UK.
anyway thanks very much!