thanks for the advice, im workin on it right now, put 3 degrees of right thrust, new 12x4 prop, and move the cg about a 3/4 inch back. but now im having a problem with my supertigre g-51 ( yea, i know, not the best for 3d), it doesnt run good without the glow starter on it. it sounds very sketchy at full throttle. this is my first time using a stock supertigre plug so im thinking that might be it. or could the engine be set up wrong? if it is the plug should i go for a hotter or colder plug? the one i have now is a medium i believe. and if its the carb set up wrong, is it more likely to lean or too rich, it was hard as hell to tune because the rpm kept going up and down, or it would just die. thanks for any help.