As for the carb. It is item #400. They have two versions. One is the "china" version and the other is the "Japanese" version. The #400 is the Japanese version.
Here is a screen cap of the one I got.
1. Air temps have not changed.
2. I checked for leaks and cannot find any. I sprayed around the intake manifold and nothing changes.
3. Float height is good.
Here are pics of the carb
