We just got back from a weekend camping trip and took the Odyssey along. We were at about 3500ft elevation and I swapped to a #140 main jet, clip in the second slot on the needle, and the engine is still running really rich. Jet black in the exhaust pipe and almost no color to the plug because it's very wet. That being said, once it warmed up, it ran like gangbusters. It brought a smile to anyone who took it for a spin. Now the suspension on the other hand....what a kidney buster. Gotta do something about that.
The idle is fine, doesn't burble or hunt around much, and the clutch winds out good when you get on it. I did put the Klemm airbox lid on it to help lean it out a bit, and even then, it still ran rich, running Polaris 2 stroke oil at 40:1 (it's all I had handy). I didn't run premium in it as I hadn't noticed that was necessary, but saw the service manual said to run it. The watercooled head did a good job. It was nice not having to worry if you weren't going fast all the time.