I've seen alot of talk here about the cost of building 2 strokes being less than 4 strokes, especially if you want the 4 stroke to be competitive. I think that statement is true. But don't you think 2 strokes cost more to maintain? You might as well buy stock in a piston company. My opinion = spend the money once and build a bullet proof 4 stroke. You can't win if you don't finish.