I have a 2002 Lazer 60" with the 37 Kohler. I hav e this intermitent prob with the throttle. Every once in a while, when I turn on the blades, the engine will rev up, then down. It will do it all day. It will start doing it, won't do it for a few weeks, and do it again. I sprayed the heck out of the whole governor mechanism, and it seems to work ok for now. What causes this??? It screws up my whole day when it does this, because it won't cut at full RPMs.