and after she warmed up, my idle was starting to race like yours. Its cooler out than the last time I had it running. I turned the air screw a 1/2 turn "in" to richen up the mixture and the idle settled down and sounded good.

Post another video if you can get your Zilla in line with that idle.

Are they big 500CC singles more fussy jetting wise with temperature change than smaller engines or multi cylinder 2 strokes?Just curious?