I have a 2006 X540 with the Kawasaki FD731V (liquid cooled, not fuel injected). 54 inch mower deck. It only has about 250 hours on it. My issue is that once it has warmed up, it surges at idle. Sometimes it will come out of it and idle fine briefly, sometimes it just dies. In addition, at full throttle when I engage the blades, the engine nearly dies before it revs back up. On occasion, it will actually die when I engaged the deck. After searching the web high and low, I came across a YouTube video of one doing pretty much the same thing. The user stated that the problem turned out to be a fuel pump and a few comments to the video stated that they had the same problem, which was also fixed with a new fuel pump. Convinced that was my problem, I bought and installed a new fuel pump, but it did not help. I have seen many other posts where the answer suggested is dirty carb - clean it. Before I go that route, I want to mention that as it idles (surging), if I manually hold the governor arm so that it stops kicking up, the thing smoothes out and purrs like a kitten. To me, that tells me the problem may not be in the carb. My thought is that if the problem is a dirty carb - resulting in not enough fuel, thereby causing the engine to starve and begin to die, thereby causing the governor to kick up and save it, well then it should run like crap when I prevent the governor from kicking it up, right? That's my thinking anyway. This leads me to believe it is something with the governor. Seems like the governor just has a mind of its own, just revving the thing up every second or so. But since that mechanism is inside the crankcase, I am really reluctant to tear that far into this engine when I'm not quite sure of the problem. Sorry for the long post. Any help would be greatly appreciated!