You can pull stumps with a 2-stroke as well, if it is correctly propped. A 12-4 on the AX (or similar 2-stroke) will pull to the moon & will be just as fast in level flight as the 4-stroke turning the 12-6, because the 2-stroke will turn that 12-4 considerably faster. The fuel thing is real enough, & so is the 4-stroke sound, but the price premium & greater care necessary with 4-strokes are significant negative factors.