I bought my 2012 RT in late spring of this year and its a great bike, runs fine and has been no trouble. However as the weather has changed it is becoming increasing harder to start with colder temperatures. It will not start below 50 degrees F at all unless I crack the throttle about 1/3 to 1/2 open, and even then it dies a two or three times before I can keep it running to get it warmed up. Once I do get past the cold start it runs roughly by itself with no manual throttle only after a couple of minutes. After it is fully warmed up there are no issues whatsoever. The starting sequence gets progressively harder as the temperature drops.
I bought the bike with 7200 miles on it. I performed the 12K service myself and meticulously checked the spark gap to make sure it was on spec before installing the plugs. The bike now has about 16,750 miles and is still under warranty. I can give it to the dealer but he'll have to keep it overnight and to be honest in the past I have found their diagnostic skills to be rather underwhelming, especially if it is a warranty gripe.
I have ruled out gas as a cause, since I have been through many tanks from different stations since the problem started. I doubt it is the plugs since they have less than 5K miles on them. It feels like I am trying to start a motor that has no choke, so I suspect whatever sensor tells the engine to supply extra gas for a cold temperature start is lacking. I have the GS911 tool but honestly I am not sure what I'd look at for that to help.
So I could use some diagnostic suggestions. I did try the trick to turn on the ignition and open the throttle 3 times then turn it off and that did nothing. I think I have done this half a dozen times just in case, with no change in starting performance. I am thinking its got to be some kind of sensor that is not transmitting the right temperature information, but not sure which that could be or how to prove that theory. Any ideas are appreciated, thanks.