by 38racing » Tue Jun 16, 2015 8:01 pm
Not exactly on topic but related. A push mower that I sold to a friend was acting up. One issue was it reving up and then back while cutting . Not your normal noload type surge. It is a 9 series vertical and I first changed the diaphragm. Same issue. I looked at the governor setup and it has two springs , large and small. Both hooked to governor lever at same position but large other end to a moveable (but not really because no throttle cable) and the small to a fixed piece. I noticed that this little one's fixed piece was not vertical so I bent it so and unit runs fine. I did some research and the little spring is supposed to prevent stalling in idle , low load situations. I found procedure for setting top no load rpm using both springs. But in this application, a push mower, there is no idle, low load situation. (which is the relationship to the topic I think). I guess that motor might be used another equipment type that uses idle speeds.