hello everyone,, WI have a 87 zuk and I went out today to set my carb.. got it running, idling, and driving very good but after that I found that I am not shooting a little smoke out the tail pipe for the first time ever,,, has a little fuel smell and what looks like black carbon on the ground...is there a air/ fuel mix on a stock 87 carb? I allways smelled like it was running rich.