My 2015 no longer does this to the extreme. A higher idle when cold, yes, and it seems normal compared to all the other kinds of vehicles I've owned.
What's changed since then? I found the vacuum leak.
In my case it was the shiny thin plastic vacuum line that runs to the intake pressure sensor (not quite the exactly correct part name) which is mounted to the left side of the fuel tank under the left plastic trim. It is very near the charcoal canister. Sorry, the Kawi website parts diagrams aren't helping me today. Anyhow, there is a very thin-walled plastic line that runs to this sensor. Mine had a hidden crack new from the factory, and others have reported the same problem. Replacing it with a regular thick rubber vacuum hose solved the problem.
The sensor tells the ECU what the air pressure is inside the intake air system. The leak was causing a bad lean misfire in the 2500-3500 rpm range, which was cured with replacing the vacuum line. Since then I have never had the runaway idle problem.
I got a feeling we aren't talking the same thing, this is the air pressure sensor for elevation.I did remove the hose and inspect it, notice the wall thickness, when done I routed it differently so I have more slack now. Man the left side doesn't look anything like when I bought it. FYI to the left is my thermo-bob #4 for snow bikes, coming out of the old thermostat housing, no stratification and it works flawlessly .The 90' fitting is my bypass line, the hose going straight down goes to the rad, the hose from the T Stat housing goes through the frame into the 90' inlet not visible from this angle, and the solution to my many adaptations with the original T Bob. You will see some white what is K wool to protect my auxiliary wiring, which is wire tied to the frame.
FYI it wasn't a waste of time, as I have been having problems with my hidden 12V outlet for my GPS, turns out the ground was damaged internally . So I got lucky and found these on clearance at Canadian Tire clearance $8.23 with fuse holder :https://www.canadiantire.ca/en/pdp/a...4554p.html#srp
and the one I installed in place of the vertical one, clearance $5.93 without a fuse https://www.canadiantire.ca/en/pdp/a...4547p.html#srp
So here is my old set up, under the plastic on the left side of the bike, my Garmin GPS adapter was always a struggle to get in, plus in heavy rain, water would go into the outlet
same one that is live all the time form my stop and go compressor mounted below the battery on the left side
and at CTC for $8.23
The one I have now mounted with the tab down and the opening facing towards the gas tank, 100% easier to get the adapter in, plus no way for water to run inside
Clearance CTC $5.93