good photo
Okay, this is helpful, I can see the actuator rod is attached to the bottom end of what I am going to call the bell crank, the side with the hole in it. That makes perfect sense. The other end of the bell crank is bent to contact the idle screw. I can't see how this happens from the photo but it must. When you pull on your trigger the rod moves forward openning the throttle, that's what is supposed to happen.
On my saw the end of the bell crank with the hole for the actuator rod is on top, the bend on the bottom. This creates 2 problems, one is that the position of the rod is raised up too high and is interrferred with by the air cleaner, when the ac is in place. two-as one squeezes the trigger the actuator rod is moved forward closing the throttle rather than opening it. This is clear to me and realize these are the issues.
However, I did not dismantle or reposition the throttle plate so it in effect would work in reverse to it's design. The throttle plate is either slightly larger than the venturi opening, at least in one direction or is somehow restricted from just spinning in the venturi opening, so the idea that it could have repositioned itself seems against my thinking.
Maybe I'm wrong, it looks that way from your photo, maybe it just flipped over during dis-assembly without my realizing it! Stranger things have happened. I can't look at it now, because it's in the shop, my frustration level peaked out and I just took it in. The saw arrived there all cleaned out and partly dis-assembled so it won't take a service guy more than 10 minutes to fix my blunder, I hope. I guess we'll see.
Thanks for your continues interest in my problem and I'll let you know where I screwed this up when I get it back.