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How to test the compression of a Victa 2-Stroke engine? This is the most common question that most of us would like to know and how to test the compression properly with the decompression valve. In this video we will demonstrate how to test the compression properly. Some does placed a spoonful of oil inside the combustion chamber to check for increased compression to check for leak through the piston rings but it's not covered in this video. You may refer to ODK forum.