Patent ID: 7334556

Claim:
A motorcycle comprising a body frame, a seat mounted on the body frame, a rear wheel operatively connected to the body frame, and a storage box arranged substantially vertically below the seat in a rear portion of the body frame, the motorcycle further comprising a powertrain unit suspended from the body frame so as to be positioned under the storage box, the powertrain unit comprising an engine and a transmission, the engine comprising a cylinder arranged along a cylinder axial line which is oriented in a fore-and-aft direction of the body frame, the engine further having a crank chamber and a lubricant oil chamber formed therein and provided separately from each other, and the engine further comprising a crankcase enclosing the crank chamber, a crankshaft supported on the crankcase, and an oil pump housed within the lubricant oil chamber, wherein the oil pump is actuated by the crankshaft; and wherein an oil pan is absent from the crank chamber; the transmission extending from a rear portion of the engine and operatively interconnecting the engine and the rear wheel, wherein the powertrain unit extends in the fore-and-aft direction of the body frame; and the lubricant oil chamber is provided alongside of and below the crank chamber.