I can't get it to run rite. I've triied everything I can think of (also everything suggested on here for tuning) except changing the jets. So I was wondering what's the most common jet sizes people are running on these Chinese quads? The carb I have is a Keihin and it has a 19mm opening measured at the intake side of the carb. The motor looks like an old Honda 3 wheeler clone.

Let me know your opinions