I am very new at all of this and am working on my first build using the Grubee skyhawk 88cc. The kit that has good reviews and has what I believe from reading is the newest carb model (the one with the red faceplate for the air intake). I've been having more issues with this bike than a magazine, but I suppose that's beginner's luck in the motorized bicycle world It sounds unitellegent, but I really would just like to know what the heck this thing does: Can anyone explain??? I've looked all over, but can't bring myself to a definitive answer!Thanks in advance. Its function, how to use it, its benefits? Anything. !!!