Yup, got the MS261 going. Rounded up all the parts I needed and got it in usable form. Even drilled out that little high side carb needle stop while I was in there. The only thing I done to it other than that is yank the muffler screen. Which is all I've done to the 550. So now I can get to some comparisons of the saws 
And a video, because seeing is believing.
[video=youtube;7uWM9tJvNBc]http://www.youtube.com/watch?v=7uWM9tJvNBc[/video]
And a video, because seeing is believing.
[video=youtube;7uWM9tJvNBc]http://www.youtube.com/watch?v=7uWM9tJvNBc[/video]