A 4-stroke IS more powerfull then a 2-stroke! Why? Because of much better cilinder filling.
Now why does a .60 4-stroke put out less power than a .60 2-stroke? Because it has only half the number of combustions. That's why it is more economical on fuel. Compared combustion stroke per combustion stroke, the 4-stroke wins hands down in the power department!
When
not
running a tuned pipe on a 2-stroke, you be surprised of how much fuel washes down the exhaust without being used.
The only reason our 2-strokes perform the way they do, is the fact that it is easier (cheaper... ) to make a high revving single cilinder 2-stroke.
The only thing lacking in our engines (2 as wel as four strokes) is ignition. From a tech point of view, glow is a horrible system...
Our 4-strokes could put out a lot more power with a proper ignition, because we could increase compression ratio dramatically...(so this is exactly what I'm going to do to my next 4-stroke)