It’s the power-to-weight ratio. Two-stroke engines are used in blowers, chainsaws, trimmers, and edgers because the power:weight ratio is far more practical for

It’s the power-to-weight ratio. Two-stroke engines are used in blowers, chainsaws, trimmers, and edgers because the power:weight ratio is far more practical for handheld tools than a four-stroke engine. Motorcycles and snowmobiles are mostly four-strokes these days because the increase in weight isn't a big deal compared to a chainsaw or trimmer.