Motorcycle has breathing-pipe hose extended from rear upper portion to vertical upper portion of breathing-pipe cover, and connected from lower portion to air cleaner

摘要

A breathing-pipe hose (74) is extended from the rear upper portion to the vertical upper portion of a breathing-pipe cover (60), and connected from the lower portion to an air cleaner (15). A breathing-pipe chamber (63) is formed inside the breathing-pipe cover which performs forward-inclination covering of the upper face of a middle case (26), and the rear of an upper case (25). The upper case is integrated in the lower portion of a cylinder block (22). Transmission shafts (31,32) are supported by the contact surface between the middle case and a lower case (27). A crankshaft (30) is supported by the contact surface between the upper case and the middle case. A crank case (21) includes the upper case, the middle case, and the lower case. An engine (13) is provided under a fuel tank and the air cleaner. The forward-inclination installation of the cylinder block and the cylinder head (23) of the engine is performed at the upper portion of the front face of the crank case.