4 strokes have more torque and can swing bigger props. great for 3d planes. I personally do not like 2 strokes., im my experiance theres too much pissing areound with needle valves. Atfer the break in period with my saito 4 strokes I set the needles once and usually never touch them again. I would put a satio 125a or 150 in that plane. Satios are pricey but worth every penny or the motors are lighter the O.S or Magnum. Make sure you follow the manual on how to break the 4 stroke in right.Remember its better to have too much power than not enough.