I have a 542 that the throttle was working fine. I tried to start it a few weeks later and it would not start. I had a second person turn it over and I manually adjusted the throttle and it started. But it only ran at HIGH idle regardless of throttle handle position. I found the linkage from the governor to the carb was really sloppy so I replaced the collar and washers. This helped and now I can start the machine without help but it runs at med to high idle and I have no real control of the throttle. I have tried to search this website and didn't find much. I looked at the prints online but it doesn't show the carb parts well. I don't see any return spring on the throttle. There seems to be nothing to maintain tension on the throttle (return to low). I am hoping someone has a picture of a 542 (>12000) or idea of what the problem is. Thanks Jay