Keep your 2 stroke if you want to tune. 4 strokes are quite tunable but they are more complicated and harder to set up. But as standard a vxr200 will do 80-85mph? And do that all day long for years and years.
there not tunable... there good for spending 2 grand on getting the same speeds as an unported 172.. bearly. any engine can be tunned.. but the 4t scoots requirre ALOT of parts or one hell of an impressive workshop and the skill to use it all
