Diesel Bombers - 2003 Kawasaki mule diesil

I have a 2003 mule, and it is gutless. Has very little power and definately has the governor set at 24 MPH. I just bought the Mule in February so I do not have a lot of knowledge on the machine. We did change the oil and filter and the fuel filter last week. Any help with the governor would be greatly appreciated.

On another note, I bought a 2003 Chevy Duromax new in 2003. Overall I'm extremely pleased with the truck. I have kept it well maintained and the only modification is a K&N air filter. I live in Denver and routinely get over 22 MPG going into the mountains.