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**Always follow the instructions in your repair manual when doing repair or maintenance work on Outdoor Power Equipment. Manuals can be found at the manufacturers website.**
In this video I show the effects a decompression valve has on the engine's compression. The decompression valve controls whether or not a channel inside the cylinder is open or closed. The channel runs from inside the cylinder to outside the engine. When the valve is open it allows a small amount of air inside the cylinder to escape, making the engine it easier to turn the engine over and start. Once the engine starts, the high pressure created by the ignition of the air and fuel mixture closes the decompression valve and the engines compression returns to normal.
