OK, got home and nearly ran out to the garage! The line from carb to vacuum advance is clear. I took the carb off and looked at the fitting that screws into it and the actual port. I know very little about carbs(obviously). The inside of the fitting has two very tiny holes that go into the main body of the carb and are just above the throttle plate.They are no bigger than a needle. Is that where it is supposed to draw vacuum from? Those holes are clear, but I can't see how much vacuum would be drawn thru them. The fitting is flat on one end with a small hole in the center (1/8"). It looks like if it bottomed out, it would cover the other two tiny holes because they are not centered. But, I checked the depth it screws in, and don't feel the flat part would be blocking the holes.
I'm sure that description is clear as mud! I can take some pictures later if needed.
