Intake:

The engine draws in a mixture of air and fuel through the intake valve into the combustion chamber.

Compression:

The piston moves up, compressing the air-fuel mixture to make it more volatile for combustion.

Combustion:

A spark from the spark plug ignites the compressed mixture, causing an explosion that pushes the piston down, creating power.

Exhaust:

The exhaust valve opens, allowing the piston to expel the burnt gases from the combustion chamber, preparing for the next cycle.