Re: 4 stroke
With oil injection you don't even have to add oil to the gas on 2-strokes much anymore.<br /><br />Lots of differences. This could get lengthy. But basically a 2-stroke fires every other stroke. A 4-stroke fires once in four strokes. The 2-stroke gets a shot of fresh oil with every upstroke, 4-strokes recirculate the same oil over and over again. Conventional 2-strokes are not terribly fuel efficient, but 2-strokes develop more horsepower in relation to weight.