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In the 2 stroke cycle all eight events occur in two strokes, one revolution of the crankshaft.
The spark plug fires and the piston moves away from the cylinder head.
Simultaneously the air‐fuel‐oil in the crankcase is compressed.
As the piston reaches the bottom of the stroke the exhaust port is exposed.
Cylinder pressure causes gasses to flow out the port.
Further movement of the piston and the intake port is exposed
Crankcase pressure causes air‐fuel‐oil to flow into the combustion chamber.
As the piston moves towards the cylinder head the intake and exhaust ports are covered and the air‐fuel‐
oil charge is compressed.
As soon as the intake port is covered, further piston movement causes low pressure in the crankcase and
a new charge fills the crankcase.
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