Diaphragm on side of Carb???

[JGunn]

Does anybody know what the diaphragm on the side of the carb is for? I'm curious if this is the culprit for my idling problem. I've heard it called the air enricher. I talked to another guy on this site and he said he was able to bypass it and his bike idled fine after he did it. I'm having some idling problems when I first start my bike and for the first 5 miles or so. I pretty much have to blip my throttle to keep the bike on. Yes I cleaned the carb and everything checks out but I have no idea what this side valve thingy is and if it's working properly. it has a spring and two screws.