Hi,I am new to this form and have used it to help with problems before so I decided to join. Anyways I am going to colorado this summer and taking the quads. I haven't the slightest clue on how to adjust the carb except for idle.:damnit: I was looking online and saw something about an air fuel mixture screw or a rejet. We are riding on trails that are around 8,000ft and I live around 1,300ft. How do I adjust the air fuel mixture or rejet on an ATP 500, Magnum 330 4x4, and Phoenix 200. Any infromation will be helpful. Thanks:biglaugh: