I just bought my daughter a 150cc yamoto. The carb was gummed up pretty bad. I had to clean it three times. It kept clogging back up. Now it runs mint but smokes pretty bad. It has plenty of power. Any ideas. i changed the oil because i thought maybe when the carb was leaking it got into the oil. I am stumped... I want to let her ride it tomorrow but it will smoke everyone out...Thanks Also i wanted t see if the air/fuel screw would do anything and it ran the same all the way in and out . No difference??