What is the purpose of a decompression valve on a chainsaw?

A decompression valve releases some of the compression from the combustion chamber during the starting procedure, making the engine easier to turn over when pulling the recoil rope.

At Husqvarna® we only use the manual type of decompression valve used in manufacturing and design. This type of decompression valve is activated (opened) by the user before attempting to start the chainsaw. Once the engine starts, it resets the valve to a closed state.