I was running my Genesis at the track yesterday without a problem, when all of the sudden after about 3 tanks, the truck kept shutting off on me. I'm trying to turn all the needles in now and start from the default setting, but I'm not sure of one thing. When I'm turning the needles all the way in, how do I know when I've reached the point when I should stop turning?? If I turn too tight, will I break something in there or can I just turn the needles in until I can't physically turn them?

you just want to lightly seat the needles. Technically you could force it to turn in farther /tighter but just get it to the stop and then start counting your turns out.