Let it idle on the sidestand is no good for your engine; just start it and ride it for a couple of miles/kilometers, but don't rev it above 4000rpm. When it's warmed up(I use an oiltemp.gauge RR10) to about 60C, you can rev it up(best is 80C, but the Tenere hardly reaches temps above this, only on hot summerdays in heavy traffic maybe).
Greetz, Hans.
