My California 1100 will only run on half to full choke. The minute you shut the choke down it immediately stalls. It has been sitting a while but the gas doesn't smell stale. It's carbs are set for Colorado 6000 feet and it is now at 2000 feet. Any help certainly would be appreciated. I'm pretty sure I ran it long enough for the engine to be warmed up. Many thanks for your help.