Two stroke engine with exhaust recirculation - has channel between exhaust manifold and crankcase with valve to mix with compressed charge

摘要

The cylinder has an exhaust port (9) opening into the manifold (8). The inlet port (10) is in line with the valve pocket (19) for the valve (21) mounted on the stem (22). The cross bore (40) is parallel to the bore (41) adjacent to the exhaust manifold (8). The valve return spring (42) fits between the valve and stem guide (22). The guide is screwed into the side of the cylinder wall. The cross bore is closed from the outer edge by a plug (46).