1. Intake stroke: The piston moves down and the intake valve opens, allowing a mixture of air and fuel to enter the cylinder.
2. Compression stroke: The piston moves up, compressing the air-fuel mixture in the cylinder. Both the intake and exhaust valves are closed during this stroke.
3. Combustion stroke: The compressed air-fuel mixture is ignited by the spark plug, causing a rapid expansion of gases that pushes the piston down.
4. Exhaust stroke: The piston moves back up, pushing the exhaust gases out of the cylinder through the open exhaust valve. The intake valve remains closed during this stroke.
four stroke order
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