Decompression valve is mainly used to reduce the compression of a 2-stroke engine to the minimum the engine can still starts so it makes it easy to pull start the engine. Chainsaw decompression valve is just simply an air relief valve when pushed and will automatically shut off when the engine runs. With the Victa 2-Stroke is a more involve internally with diaphragm pump. In this video we will demonstrate how to test the Victa 2-Stroke decompression valve in two ways. One is testing with vacuum (common practice) and the second way is just my own method which you haven't seen before.