i got fed up with the engine so i decided to put it in the plane anyway to see if that would make any difference i then reset the spray bar needle with the carb at what should be close to idle and it seemed somewhat better then i pulled the plug out and looked at it to see if the entire coil glow and found there to be what looks like rust spots on the plug so i guess this points toward contaminated fuel, the weird thing is that my os 46FX runs great on this stuff still and i have only now seen the slightest bit of the tell tail bubbles on the top of the bottle, i guess it is quite possible that the fuel tolerances of these two engine are different so we will try that, think i am on the right trac?