Hello,
I am a new Rocket III Roadster owner, just picked up my 2013 model last week.
I am experiencing the same symptoms as others have described: erratic stalling, when downshifting. Engine our outside temperature does not seem to have an effect.
The stalling always seems to happen, when downshifting from 3rd to second gear (will pay extra attention when I ride next time).
Couldn't this be a clue? Why wouldn't it happen e.g. from fourth to third? Is there a gear position sensor that could be involved?
Greetings from Colorado,
Armin