Transcription: Inside the internal combustion engine of a motorbike, petrol is burned to release the energy needed to move it. This process happens in a series of four strokes or movements, giving the engine its name, a four-stroke engine. First comes the induction stroke. The inlet valve opens as the piston descends, sucking in a mixture of petrol and air. During the compression stroke, the piston goes up Squeezing the fuel mixture, both valves are closed. Next comes the power stroke. As the spark plug ignites, the exploding fuel pushes the piston down again. And finally, the exhaust stroke. The piston goes ...
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