Phillip,
The cylinder bore I read is .044" for the .061ci, and .040" for the .049ci. The measurements were made with my analog calipers, so they are not exact, but surely close enough to identify the displacement of your engine.
Disconnect the fuel line at your venturi, and you should get a burst of power from a prime.
Be careful to keep the fuel level even with, or slightly below the venturi on the bench, as siphoning can load the case while flipping.
Using a 5X3 prop makes starting a little easier. I beat my finger to death flip starting my first .061, and it was the main reason I purchased a half-A electric starter!
Norvel are great engines, but they handle a little different than Cox, or other early half-A engines.
Bill