The plane just asks for a 4 Stroke. My experience is the 4 stroke will swing more prop than a 2 stroke. 4Strokes also like to be loaded and using a 3 blade prop would really look nice on the plane.

There has been mention of not leaning the engine too much. Also mention of a longer break in period due to the ringed configuration. You will need a tachometer to properly set the 4 stroke. Bring the engine up to high throttle and set it to 200 to 300 RPM less than max after being broken in. Use 300 to 400 RPM less for break in. Most all local fliers are using 20/20 pattern fuel which contains 20% nitro and 20% oil content. The oil content is most critical with a 4 stroke. Most fuels labeled 2 or 4 stroke do not have enough oil content. Low end tork is what is needed for scale planes. This is what gets you off the ground and flying.

My 2cents,

EXCAP232