keihin carb

I'm looking into getting a performance carburetor for my Warrior. The stock one is kinda junk from wear and tear. It runs, but doesn't run good. I've cleaned it many times, and I have to clean it more frequently. Anyways, what carbs do u recommend. If anyone knows how I can get my hands on an...

All, I am running a 38mm PE keihin carb on my 90 warrior. My jetting is a #160 main, #50 pilot and AJM needle on the second notch. My problem is my plug is covered with black soot. At idle and with a short rev there is a lot of black smoke coming from the exhaust. If I put in a brand new plug...