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In the first stage, the intake valve opens, and the piston moves down, allowing the air-gasoline mixture to enter the combustion chamber. In the second stage, the intake valve closes, and the piston rises, compressing the mixture. In the third stage, the spark is ignited at the spark plug, which causes the combustion of the mix and pushes the piston down. Finally, the exhaust valve opens in the fourth stage, and the piston rises again, expelling exhaust gases.