About 2 years ago I took these carbs apart cleaned them up put em back together. I did not change the needles. But I did change the setting of the needles. When I took them apart the shoulder of the needle was even with the bottom of the piston. When I put them back together I put the shoulder of the needle even with the groove in the bottom of the piston. I heard somewhere that this was the correct way to set them. Is that the correct way to set them? Brett, it sounds like you nailed this problem down, I hope, because I tried just about every other thing I could think of. Where can I get new jets? Do I need to replace needles too? If so where do I get new needles?