Decompression device in a two-cycle engine

Abstract From the Canadian patent

For the purpose of preventing a decompression passageway in a two-cycle engine from being blocked by carbon soot, facilitating manufacture of a two-cycle engine having decompression means and eliminating reduction of an output power of a two-cycle engine caused by decompression means, the known two-cycle engine having decompression means in the prior art has been improved. The improvements reside in that there are provided a scavenging passageway formed along an inner wall of a cylinder as directed in the axial direction and communicating with a crank case, and a decompression groove scooped in the axial direction of the cylinder on the upstream side of a cylinder cooling airflow at the top …