RE: pros and cons of 2 and 4 stroke engines ?
A 2 stroke fires on every other stroke or one complete revolution of the crankshaft. Bang! Piston goes down, comes back up and Bang! Repeat.
A 4 stroke fires once every fourth stroke. Bang!, blow, suck, squeeze.
2 strokes spin faster. 4 strokes can turn bigger props and have more torque.
4 stroke use less fuel (usually) and sound real *****in. Best choice for a scale plane or warbird.