In another post Rich mentioned that he disconnected his AAR & CS Valve saying they weren't necessary where lives, which I'm pretty sure is lower Slobovia. So I thought I would disconnect mine here in SoCal. Guess what? My idle stabilized. Impossible! It tested fine when I first resurrected this engine but was now sticking open. So I took the opportunity to take a few shots of this AAR valve in action. I will try to post 6 pic's so it will probably take 2 posts.
Ambient temp = 71F
Humidity = 100% rain

First pic shows the valve temp after a 10 min quench in the freezer. Temp's shown are the skin temps and are surely different than those at the core or bi-metal strip which controls the degree of movement within the valve.
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This shot shows the valve opening at this temp. It appears to be 1/2 open. Will it open further? I don't know but at this setting I could blow thru the valve without any noticeable back pressure.
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After energizing the AAR for 5 min's the surface temp was 97.1F as shown.
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This 3rd pic shows the valve in the partially open position, which corresponds with the rise inn temp to 97F
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This next pic shows the temp after energizing for 10 mins.
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And finally, this pic shows what appears to be fully closed......Wrong. It was still passing air. After a couple of WD-40 showers it seems to be closing completely, now.
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Kent, you have spent way to much time at Harbor Freight buying semi-useless tools to find a use for.

Hey, that's the best I've got for this thread.

Yup, a good lubrication is all that a lot of these valves need. I've also helped free stuck valves by poking a small screwdriver into the hole and 'nudging' the piston to help it move.

Great info here!