Finally solved the carb problem after removing it a number of times. I cleaned every part except the center hole in the pilot jet. That's why I had so much trouble with the choke and high idle. The quad now starts first pull, idles up a little and goes to low idle after it warms up. I checked all the other carbs that I have and every one of the pilot jet center holes were plugged solid. I used a fine torch tip cleaner to unplug them. Thanks for the reply and info. I now have the Mikuni carb schematic on file. Will post some pictures, once I get the body work done.