Originally Posted by Mr Cox
Why do you think that you have the .049?
The case clearly says 1.0 as in 1.0cc which is equal to .061 cu inch.
It is, indeed, an .061 . The casting indicates a 1cc displacement as does the writing on the engine (many times the writing would be on the bottom of the case below the mounting lugs). A .049 is indicated by a 0.8 displacement.
The engine is an early model AAN design --- this is indicated by notched fins on the cylinder. The indicator that it is an early AAN is the glued in carb body. Later carbs were retained with a thru-bolt.
It's possible that it is the higher performance AME, but not likely. While looking into the exhaust port, if you can count 5 round intake ports (two of the ports are located at the front and back of the cylinder), then it is a lower performance model; if you can count 3 large oblong ports, it is the higher performance model.
If you keep your model light, it will fly nicely with this engine. The Champ was designed to fly "on the wing" and does not need a powerhouse to be a good performer.