A friend of mine has a Grizz, and it had sit for a couple of months, now he is getting it back going, and put a different pilot in there. It runs great from idle to 1/4 throttle, then from 3/4 to full but in the middle, it spits, sputters, and all around runs like complete junk. Anyone have any suggestions? We have gone from 2 1/2 turns of the A/F screw out to 1/2 turn out with little difference.