This allows atmospheric pressure to force the air-fuel mixture into the cylinder bore as the piston moves downward. During the intake stroke, the intake valve between the carburetor and combustion chamber opens.
It’s the job of the carburetor to supply a mixture of air and fuel that will allow for proper combustion. In order to power your equipment, the overhead valve engine completes a repeating 4-step process detailed below.Įlement that Allow Internal Combustion Engines to RunĪir and fuel enter the small engine through the carburetor.