As a general rule, 4 strokes tend to be much flatter than 2 strokes, that said the 2 stroke rises very fast, but dies just as fast, this is why with conventional 2 strokes, you can be cruising along, hit the back of a swell, and the motor just dies, you give it a heap of throttle and you're off again, then you have to pull back the throttle to prevent going too fast! 4 strokes tend to just plod along at cruise speeds.