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4 cycles consist of:

Intake cycle

Compression cycle

Ignition cycle

Exhaust cycle

Intake cycle - piston in lowest position intake valve open allown atomized fuel to enter combustion chamber

Compression cycle - piston in upward stroke compressing atomized fuel mixture All valves closed

Ignition cycle- Spark is introduced to combustion chambeer blowing piston back down in chamber valves closed

Exhaust cycle- exhaust valve open piston rises in chamber to expel spent gasses.

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