hey, i have a jato, and i have trouble tunning my engine. it still runs and everything, i just cant get that "sweet spot." i move the needle about 1/8th of a turn, is that too much? also, if there is a little bit, not a lot, of smoke coming out, and the engine just quits, is it too lean or rich. im running it on a traxxas 2.5 with stock air filter, exhost pipe, so on and so forth.... HELP PLEASE!