While people usually complain about the noise, the far bigger concern is pollution. Almost all of the power-weight advantage in the lightweight two-stroke engi

While people usually complain about the noise, the far bigger concern is pollution. Almost all of the power-weight advantage in the lightweight two-stroke engines used in these machines is gained with partial combustion of lubricant-enriched fuel and no emissions control. With some pollutants it is something like two to three magnitudes of order worse per unit of energy produced, compared to a low-emissions car engine.