Patent ID: 7367295

Claim:
An internal combustion engine comprising: a crankcase; a crankshaft disposed within the crankcase; a cylinder block connected to the crankcase, the cylinder block having a cylinder disposed therein; a main exhaust port in fluid communication with the cylinder; an auxiliary exhaust port in fluid communication with the cylinder; a piston movably disposed within the cylinder and being operatively connected to the crankshaft; an exhaust valve assembly, the exhaust valve assembly comprising: a main exhaust valve for at least partially closing the main exhaust port; an auxiliary exhaust valve for at least partially closing the auxiliary exhaust port; an actuator for actuating the main exhaust valve and the auxiliary exhaust valve, the actuator including: a rotary shaft having a first gear and a second gear, the rotary shaft being operatively connected to the main exhaust valve via the first gear, the rotary shaft being operatively connected to the auxiliary exhaust valve via the second gear, the first gear having a first radius R 1 , and the second gear having a second radius R 2 , R 2 being greater than R 1 ; an electric motor operatively connected to the rotary shaft for rotating the rotary shaft; and the engine operating on a two-stroke principle.