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Video family stroke

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Video family stroke

Our 4-stroke engines lead the world in production and quality.

In overhead valve (OHV) engines, the valves are positioned above the piston.

The camshaft moves the valves through a tappet, pushrods and rocker arms.

4-stroke OHV engines provide more efficient combustion by allowing the air-fuel mixture to spread more evenly throughout the combustion chamber.

In order to power your equipment, the overhead valve engine completes a repeating 4-step process detailed below.

Element that Allow Internal Combustion Engines to Run.

Air, fuel, compression, spark, step 1: Intake Stroke, air and fuel enter the small engine through the carburetor.

Its the job of the carburetor to supply a mixture of air and fuel that will allow for proper combustion.

During the intake stroke, the intake valve between the carburetor and combustion chamber opens.

This allows atmospheric pressure to force the air-fuel mixture into the cylinder bore as the piston moves downward.

Find out how to troubleshoot carburetor repair and clean / maintain your small engine carburetors.

Step 2: Compression Stroke.

Just after the piston moves to the bottom of its travel (bottom dead center the cylinder bore contains the maximum air-fuel mixture possible.

The intake valve closes and the piston returns back up the cylinder bore.

This is called the compression stroke of the 4-stroke engine process.
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