How do I adjust the idle. It is a howel motor 48cc or 50 or whatever. At the trottle grip or at the Carb. Also, what is up with that screw on the carb. The one with the spring on it. also, there is a little metal thing that looks like a primer from a gun next to it like a little button. What is that? Finally, what kind of clutch do I have, and is it okay to ride it to get the bike going good, or will it burn it up? It is a howel motor How many horse power do I have. Sorry about all of the questions. I am just stoked about my bike.