Inspired partly by my desire to attack the bike with wirecutters, and partly by the tumbleweed blowing across this thread, I headed back to the garage with the Kev mod.

My theory, made up entirely of guesswork and assumptions, is that if the bike at cold start doesn't use the closed loop, it must use the open loop. Seems reasonable. So, fitting the Kev mod should mean that when the bike is cold, I can adjust the resistance with the Kev mod and notice a change, right? Wrong. Still nothing.

My lovely wife said as I trudged back into the house, "Why don't you sell the XT and get a bike that just works properly when you buy it, like all the other bikes you've had?". You know what, she might just have something there!

O2 controller and Kev mod for sale. Oh, and an XT660.