Abstract: A cooling water passage structure for connecting cooling water passages in cylinders forming a V-shape in a water cooled type V-shaped internal combustion engine. A front cooling water passage of a front cylinder communicates with a front cooling water passage of a front cylinder head. A rear cooling water passage of a rear cylinder communicates with a rear cooling water passage of a rear cylinder head. Water pipes and cylindrical portions project from opposed positions of the front and rear cylinders and extend in one straight line. A connecting pipe is formed of rubber and is inserted in the water pipes. Ring clips and are engaged with annular grooves formed on the outer circumference of the connecting pipe at the front ends of the water pipes. O-rings are engaged with the outer circumference of the connecting pipe near the opposite ends thereof. The water pipes are connected to each other in a water tight manner.

Abstract: A water pump for feeding water under the action of centrifugal force created by rotation of an impeller disposed within a pump case includes a cooling water discharge port formed at a position offset in the axial direction of the pump from the outer peripheral portion of the impeller. A flow path structure having a projecting portion for guiding cooling water from the outer peripheral portion of the impeller up to the discharge port is intended to provide a flow path structure capable of smoothing the flow of cooling water, thereby increasing the amount of cooling water discharged and improving the pumping performance.

Abstract: An intake pipe for absorbing vibrations of an internal combustion engine to prevent the transfer of the vibrations to a carburetor. The intake pipe includes an intake pipe body made of aluminum which is connected to an outlet portion of a carburetor. An intake pipe mounting flanges is made of aluminum and abuts with the intake inlets of intake ports formed respectively in front and rear cylinder heads of an overhead valve type, longitudinal V-shaped, two-cylinder, internal combustion engine. A coating member is made of rubber. The coating member covers the outer peripheral surface of the intake pipe body to combine the intake pipe body and the intake pipe mounting flanges with each other in an integral and airtight manner. The intake pipe body and the two intake pipe mounting flanges are formed as integral members.