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I agree that it very likely could be a governor issue. I checked for freedom of movement statically and with it running. I will need to find a maintenance manual to go beyond that, unless you can recommend a testing method...

A coil failing is interesting, but I'm surprised that is runs so long at full RPM occasionally. I will look at a fresh coil as it should be both easy and worth doing for reliability

No ethanol. I only use premium which is ethanol free in our area.

I will check that the cap is venting properly. Also will take a look at whether it has a carb or injection.

Air filters are clean and recently replaced.

New to the forum and new to working on Kubotas. I did search the forum, but did not find much related to my mower... I have a 2011 Z725 - 60" with a Kholer 25HP engine that usually starts and runs with what seems like about 1/3 throttle, though the throttle is at full. After a while, but very...