If you're using heli fuel and you're not getting much smoke, you're super lean [X(] Heli fuel has more oil and tends to let off a lot more smoke than say car fuel. Also, tune high end needle first, once you get it where you want, then tune the low end. The low end isn't a huge deal though as it would be in a car, as long as you get a decent idle, that's all you need since heli's pretty much run at nearly full throttle. Good Luck!