This is literally the first time I have ever touched a carb. I have no idea what Im doing.

Its a Mikuni TM40-6 and I basically have 3 questions.

1. Is the choke on when its pushed in or pulled out?
in off, out on


2. Is the plastic knob the idle adjuster?
Yes

3. What is the brass like screw on the outside of the bottom?

Air/fuel screw

http://www.mikuni.com/pdf/hs40_manual.pdf

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Edit: thanks guys

Now I just need to figure out why it starts to die in 4th and 5th. 1st, 2nd, and 3rd all pull up to speed pretty good. Then 4th bogs and I lose a few MPH.