Patent ID: 7644687

Claim:
An internal combustion engine having an exhaust side and a side opposite the exhaust side, the engine comprising: a crankcase, a crankshaft adapted to rotate about a crankshaft axis, and at least two bearings supporting the crankshaft within the crankcase; at least one cylinder having a cylinder axis and a cylinder head above the at least one cylinder, the at least one cylinder and the cylinder head together defining at least one combustion chamber, the exhaust side of the engine being disposed on one side of a central plane of the engine defined by the cylinder axis and the crankshaft axis; a piston disposed in the at least one cylinder and operatively connected to the crankshaft; an intake port connected to the at least one cylinder for allowing at least one combustion component to enter the at least one combustion chamber; an exhaust port connected to the at least one cylinder for allowing exhaust gas to exit the at least one combustion chamber; and a liquid cooling circuit including: a cylinder cooling jacket at least partially surrounding the at least one cylinder, and at least one cooling passageway on the side opposite the exhaust side of the engine, the side opposite the exhaust side being disposed on an other side of the central plane of the engine, the at least one cooling passageway being disposed above the crankshaft axis and extending from the crankcase to the cylinder head; the internal combustion engine operating on a two-stroke principle.