The great advantage of petrol mowers is their independence. Engines are typically single cylinder four-stroke designs with manual pull-cord starters. The arrangement of the power train varies, with the motor driving the cutting blade and optionally the roller or wheels as well, saving the operator the trouble of having to push.
Some frightening statistics have been put about concerning pollution from petrol mowers. The noise pollution is obvious, but the fumes are very problematic even compared to car engines. I think petrol hover mowers are a particular poke in the eye to the green brigade. There's something about the look of them that thrills.
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