2-stroke vs. 4-stroke engine? What’s the difference. Both powers the vehicle, but they work in totally different ways. A 2-stroke engine completes a power cycle in two piston movements—compression and power in one stroke, while exhaust and intake in the second stroke, it does all these in one revolution of the crankshaft. 2-strokes are lighter, higher revving, but wear out in due time. On the other hand, A 4-stroke engine needs four movements—intake, compression, power, and exhaust—to complete o