Petrol Lawnmower Guide - How It Works
How your Petrol Lawnmower functions step by step
Most modern petrol lawnmowers have compact four-stroke engines, which take unleaded petrol. Depending upon the model, the motor powers either rotary or cylindrical blades.
| 1 |
Most small engines require the operator to pull a starter cord to 'kick' start the motor. Some larger self-propelled models may have a battery and starter motor. |
| 2 |
The petrol engine turns the blades directly. On some models there may be a separate brake to stop the blades. |
| 3 |
The speed of the blades is adjusted by the throttle on the handlebar. This pulls a cable that opens and closes a valve in the carburettor, to control the amount of fuel delivered to the engine and, therefore, its speed. |
| 4 |
The rotating blade under the mower deck lifts and cuts the grass as it spins. Grass cuttings are blown through the grassbox channel and deposited on the lawn or in a box, if fitted. |
| 5 |
The cutting height is determined by adjusting the height of the front and rear wheels. This is done by moving levers. |