After getting the wagon on the road yesterday, when it ran smoothly but weaker than expected, today was a day to refine the performance.
Fix 1: The throttle linkage wasn't opening the throttle all the way. Adjustment made.
Fix 2: One of the gaskets was constricting the airway. The rebuild kit must have included a gasket for a different version of the
carburetor, and I hadn't noticed because it fit in other respects. The diameter of the gasket was about 3/16" to 1/4"smaller than the throat of the carburetor. Maybe it's supposed be that way, but I trimmed it to the same size as the carburetor.
Fix 3: Adjusted the float levels. These were off a little in both directions, but probably not enough to affect the performance. In truth, I thought the bowl was overflowing because the carb was wet around the base, but upon further inspection, it turned out to be oil, no doubt from the oil bath filter.
Fix 4: Adjusted the idle screws.
Out for another run, it was much livelier, more like I thought it should be.