Half turns? why would you count half turns as full turns? If you adjust a carb in half turns you'd be running pretty lean! most carbs that I have run accross, the high end is anywhere from 2 1/4 turns out to 3 turns out, now of course theres the high output motors that I've had to adjust as far as 6 1/2 turns out, they love fuel! I adjust my trannys with full turns, try running it in and turning 4 1/2 to 5 full turns out and see how it shifts for ya! If its still not quite there, adjust in 1/4 turns sentiments (turns), they are pretty senitive.