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When you took it apart and cleaned it, did you put a new carb kit into it? People talk lovingly about the older generation of cars, but the thing they skip over is all the wearable parts. As in parts that are fully expected to just wear out and stop working. There's tons of them too in old generation cars!
For your case a carb kit would replace all the gaskets, seals, and give you a new needle and seat. This became a kit because all these parts get old and brittle and wear out. Because the carb is a precise device that depends on the vacuum of the engine to operate, any tiny little gasket leak or poorly closing value causes all manor of performance problems.
I didn't but the carb is pretty low-miles. I might have put 500 miles on it in the 10 years since I replaced the carb. I did blow it all out and cleaned out the float bowl. Maybe I missed blowing something out.
Even without miles, age can make the seals get brittle. Also, have you checked the idle setting? If it’s misadjusted you can have all sorts of odd behavior.
Been fiddling with the idle mix adjustment screws a lot. Doesn't seem to make much difference.
Yah, I get that age will do it as well, but really 10 years isn't much for a rebuilt carb unless it was truly subpar materials. But possible I guess.
That's usually a sure sign you still have an obstructed pilot or air jet.
Edit: So you apparently don't have a pilot jet, it's called an "idle pickup tube" in the diagram below. Make good and sure it and the 2 air bleed passages are clean (there is one pickup tube and 2 air passages per "barrel").
That's a very helpful diagram. I was blocking off holes while it hit it with air and trying to figure out what the flow was. I'm going to go over it again with this on hand.
Keep in mind that only shows the idle circuit. But that's probably where your problem is. Also double check float height if you haven't.
Float height, you mean? Yah, I did that.