* Allows the air-fuel mixture to enter the cylinder.
* Located on the head of the cylinder.
* Opens when the piston moves down the cylinder.
* Closes when the piston moves up the cylinder.
Exhaust Valve
* Allows the exhaust gasses to escape from the cylinder.
* Located on the head of the cylinder.
* Opens when the piston moves up the cylinder.
* Closes when the piston moves down the cylinder.
