I don't remember what its called but if you disable it, do you really notice it? I know it leans everything when you get on the gas and richens it when you let off. The last few days, sometimes when I really lay on it, it revs out fine but doesn't have all the power. I guess this thing has something to do with that. I'm trying to figure out what I want to do next to my bike. I have a feeling that when I get the new back tire, its going to feel a little underpowered again when it doesn't spin as easy. I figure I'll either get a YZ cam or go with a 13.5-1 piston since it won't run right on pump gas anyway but this thing on the carb is bugging me. Can you really tell any difference when its disabled?