1. Intake stroke - The intake valve opens and the piston moves down, drawing air and fuel into the combustion chamber.
2. Compression stroke - Both valves are closed, and the piston moves up, compressing the air and fuel mixture.
3. Power stroke - The spark plug ignites the compressed mixture, causing it to rapidly expand and push the piston down.
4. Exhaust stroke - The exhaust valve opens, and the piston moves up, pushing the burnt gases out of the combustion chamber and into the exhaust system.
state stroke odrer of a four stroke, four cylinder, spark ignition engine
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