Patent ID: 8464684

Claim:
An internal combustion engine mountable on a vehicle, the engine comprising: a crankcase; a crankshaft rotatably disposed within the crankcase; a cylinder block connected to the crankcase; a cylinder head assembly connected to the cylinder block; a cylinder formed by the cylinder block and the cylinder head assembly; a piston reciprocally mounted within the cylinder block and forming a variable volume combustion chamber therein, the piston being operatively connected to the crankshaft; an intake port fluidly connected to the combustion chamber for allowing at least one combustion component to enter the combustion chamber; an exhaust port fluidly connected to the combustion chamber for allowing spent combustion components to exit the combustion chamber; and a dry sump lubrication system for lubricating the engine with oil, the system including an oil tank, multiple oil paths through the engine, the multiple oil paths including a first oil path, the first oil path including at least a portion of the cylinder head assembly, a second oil path, the second oil path including at least a portion of the crankcase, at least one pressure pump in fluid communication with the oil tank and the multiple oil paths for pumping oil from the oil tank through the multiple oil paths, and at least one suction pump in fluid communication with the oil tank and the multiple oil paths for pumping oil to the oil tank from the multiple oil paths, the system being constructed and arranged such that when the engine is mounted on the vehicle, and the vehicle is level and upright, and the engine is not in operation, oil in each of the multiple oil paths collects at one of a plurality of oil collection portions, each oil collection portion being at a low portion with respect to gravity in one of the respective multiple oil paths, the system further including a plurality of oil path drainage openings, at least one oil path drainage opening being fluidly connected to each oil collection portion allowing oil collected at the oil collection portion to be drained from the system; an oil tank drainage opening fluidly connected to the oil tank to allow oil stored in the oil tank to be drained from the oil tank; and a single drain plug simultaneously removeably sealing each of the oil path drainage openings and the oil tank drainage opening, such that substantially all of the oil in the system is drained from the system when the single drain plug is removed, the drain plug having a body having an outer surface and an end, the end sealing one of one of the oil path drainage openings and the oil tank drainage opening, the outer surface sealing a remainder of the oil path drainage openings and the oil tank drainage opening.