Hey beestoys, I had a code 25. No loss of power or running in my case.
Did the "loom fix", thoroughly cleaned of all electrical connections and added a new ground wire to the low beam green wire near the bulb and the code went away for about 15K miles.
After the code came back I rode for some 10K more miles at which point I obtained a new used ECU.
Becool, as beestoys says, code 25 is the knock sensor. However, the knock sensor is never the problem. It is either a wiring issue, or a bad ECU. I forgot to mention, first check, is the ECU properly strapped down? Should be a heavy rubber O ring on it. Also, inspect and carefully clean the pins on the 2 multi pin connectors.