See this post for the service manual:
http://www.kymcoforum.com/index.php?topic=6636.0Doesn't seem to mention what the buttons do; I did the same thing Nigel suggested, but only recently did I find out how to change the temperature.
On this topic, are anyone else's gauges way off? Temperature is okay, but once read 99 F when it was only 70 F outside, and it almost always reads 55 F when I leave the house. Fuel gauge is completely messed up, and after 2 bars (out of 10), I am at half a tank. The last 5 bars seem to be only 1/4 of the tank. The speedometer is about 10 MPH slow (I have to go 50 MPH on the speedo to actually go 40), and the clock loses time after a couple weeks (says 3:00 when it is really 3:10, etc).