Originally Posted by Lee510
Or he could've just asked me, as I rode right through Park City last week.
If you have friends with K13GTs, then you already have some idea. The '09-'10 K13GT is a "new & improved" version of the '06-'08 K12GT, where several niggling problems were fixed. New K13 problems mostly had to do with the switchgear, which has been well sorted with new parts.
K12 issues range from poor fueling (fixed with new airbox and software), to EWS Key errors (fixed with a new ring antenna), to weak center stands (fixed with K13 center stand), to shifter bolts breaking (fixed with K13 bearing parts), to random brake pad wear warnings (fixed by disabling the pad wear sensor circuit), to TPM read failures (fixed with a new TPM control unit), to cam chains jumping (fixed with new hydraulic tensioner and cam chain jump guard), to final drive failures (fixed with redesigned final drive), to the occasional ABS failure (it's rare, but there's no real fix found yet besides replacement).
Now not every bike has all these problems, of course, and most of these items should be sorted by now, but they sometimes sneak through on older models. And some of them can be rather expensive.
Still, the K12GT is a great bike, and most owners get many happy miles from them. So if the bike you're looking at runs and rides well, and is a good price, then go for it. Just be aware that it's a BMW, so it's kinda like playing the German Lottery, where you can be quite sorry if you "win" . . .