When people say four strokes have more torque or power they are compairing apples to oranges. That is they are compairing larger displacement four strokes to smaller two strokes. A .91 four stroke will usually have more torque than a .61 two stroke and with the same or slightly more power. They are as light as the two stroke. Modern two strokes are lighter and better at low torque power. For example the newer .91 and larger two strokes are lighter than the older ones and almost as light as the four stroke. They are more powerfull and have more torque than the same size four stroke. On the high end the OS 1.4 is equal to the YS 1.4 and the fuel injected version is now the pattern engine to compete with.