I posted a couple of threads about the carb and problems I having with my 2284 running rough. I ended up ordering a new Chinese carb, as a last ditch effort. I got on for my ch22 Kohler, that even had an accelerator pump on it. The original one didn't, but someone here mentioned it. The carb came in yesterday, I threw it on real quick and the engine runs perfectly. No choking problem, no hard starting. I very happy. But I have a slight problem. The new carb has an extra "small tube", right in front of the fuel selonoid. I almost missed seeing it. The old carburetor doesn't have that odd tube. When it's running, I held my finger on it.. no change. It starts just as easily with or without my finger on the tube. I don't feel any suction on the tube. Anybody know what this tube is meant to do? The engine runs so smooth now, I was just gonna ignore it, but then I figured I'd ask hon here. I attached pics (Thanx in advance for bearing with silly questions like mine, but I just started tinkering with engines a few months ago). One pic shows the tube, one pic shows the tube with the black "shipping cap" still on, so you can pick it out.