Are you a Kawasaki dealer? If so do you know of any issues with the FH 721V Nikki Carburetors? I have a customer that just installed a brand new engine and it hunts/surges at no load. It clears up somewhat with some choke. I reset the static gov setting, and went through the carburetor and all ports are open and can't find any air leaks. I don't think it's jetted right, but have never seen anything like this on a Kawasaki before.