Rare i get a 250 to work on live, right here. However an EX500 twin vid to be attached, running perfectly after valves set and carb/petcock refurbs and carb pilot set and synch.
I prefer to use the mid-spec on intakes, loose end on the exhausts.
Anyways, here's the vid, during which I was checking for petcock leaks. Note steady
1200 rpm idle.
https://www.youtube.com/watch?v=cZ4X5uOb6Xk
Added a bonus vid....a '38 BMW I got running from a long slumber. Similarities in idle, no?
https://www.youtube.com/watch?v=Y8JSrpUpNig