I have a liquid cooled 27 hp Kawasaki with about 1300 hrs on it. Late this last season, it started to run really bogged down at start up and could take anywhere from 30 seconds to several minutes before it would kick in and run normally. It really has no power at all and the machine will just about stall if I try to move it and forget about turning the blades on. It sounds as if something is opening up inside when it kicks in, and then everything runs as it should. I don't know how to diagnose these symptoms, but I can fix it if I know what is causing the problem. Thanks.