Patent ID: 6557504
Filing Date: 2003-05-06
Classification: F02B,F02D,F02M

Abstract:
A two-stroke internal combustion engine comprising;a cylinder (10; 50); a movable piston (11; 52) within the cylinder (10; 50), the piston (11; 52) and one end portion of the cylinder (10; 50) bounding a combustion chamber (16; 51); a crankcase (15; 53) connected to a second end portion of the cylinder (10; 50); a scavenging duct (17; 56) connected to the crankcase (15; 53) and the combustion chamber (16; 51), the scavenging duct (17; 56) being opened and closed in response to movement of the piston; a carburetor (20; 55) connected to the crankcase (15; 53) via an inlet port (21); an air duct (30; 58, 59, 60) for supply of atmospheric air to the scavenging duct (17; 56) to achieve a pre-scavenging of the combustion chamber with atmospheric air reducing the losses of unburned air/fuel mixture via an exhaust port; and a fuel pipe (23; 61, 70) for supplying fuel from the carburetor (20) to the air duct (30; 58, 60) during an engine start-up period in order to simplify starting of the engine.