Good stuff Friiy.
.....confirmed the dumping of carb spray into the air jet with the spring should produce a decent spray, not drip, into the throat on the same side as the jet.
Spraying in one of the back holes on the maifold side should produce some liquid from the air exit port on the top of the carb. There are two bosses on the top at right angles to the throat. One of those should have a hole and possibly a right angle with a piece of short hose on the end. That's a vent and where the dribble or air should come out when you spray from the back.
On the top of the carb is a screw with a fixed metering hole. If you spray in there the cleaner should end up in the bowl area. There are a few places it may come out of depending on the carb.
One place is at the bottom of the center tube. On some carbs there is a small hole at the bottom of the inside tube wall. A second tube is cast into the main tube. The second tube usually has a small ball pressed into its end. Above the ball there is usually a small hole. When you spray from the top fixed metering jet liquid should come out of the second tube hole. It should spray out and not dribble. Your carb may not have the hole at the bottom.
There is another possible route higher but you should can see liquid comming out of the center tube.
The above possibilities I think are all in the low idle circuit. In general when you spray into a port cleaner comes out as a spray or dribble either in the throat or bowl area, most often a spray. Your carb had the thin varnish and the thick goo probably from evaporated oil. The chances are high the internal passages are still plugged or partly plugged. That's a good reason to prod well, dip, dump in lots of carb spray and high pressure air.
