sputtering in corners on low end and will miss/Pop every once in a while in the meat of the power. Cleaned carb. Moved the needle clip: up one. No better Down one. No better Used a 37.5; 40 and 42.5 pilot. Still sputtering. No better. Runs great WFO. pops in corners and misses. Would miss in the rollers and almost kill me every lap and I decided to bag it and run my (brothers) other 125 which runs perfectly. Help.