Where is the Air/Fuel Screw on the carb? I see several screws. My engine is running lean since its colder out, and i don't have that stock cover on the airfilter. It only bogs a little when you hit the gas from idle or close to idle. Gracias Amigos

 

the Top screw (i think it was a phillips) is throttle screw,and the lower screw which is a small flat head screw is your air screw.
The Air-screw should be 1 1/2 turns out from bottom,and adjust your throttle (the top phillips) screw to 1700 rpms 100+/-.