Working on this machine for a customer. Has an issue with the governor. It's a Kawasaki FH491. When you start it with the throttle at low speed, it idles well. But once you move the lever, it goes to wide open until you shut it down. Governor lever will not back off when it's running like this, leading me to think it has an internal issue. You cannot get it to go back to idle at all, even tried pliers on the throttle linkage. Wouldn't budge. Is this thing about to self-destruct?