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Pulled the cover. Can increase engine speed to a normal idle before rack “lets go” and then moves substantially, decreasing speed and increases haze from muffler. Suspect something with the rotary governor mechanism?

Will do. And if the engine speeds up, what do you think is the problem? Are these pumps serviceable, or are they just remove and replace?

I have a Kubota 905D engine used as a power source on a generator set, powering an irrigation system. It has between 4-6,000 hrs on it, well maintained. Proof meter has been replaced a few times over the years. Does not burn oil, starts reliably and has been a good unit. The throttle is...