Yamaha Hatsudoki Kabushiki Kaisha

Sanshin Kogyo Kabushiki Kaisha

Naoki Katoh

Ryoichi Nakase

Shigeyuki Ozawa

Masayoshi Nanami

Keiichi Hiki

An improved fuel delivery and injection system for a small watercraft engine reduces the heat effects within an enclosed engine compartment upon various components of the engine and upon the fuel within the fuel system. The fuel system integrates a fuel pump within a fuel tank at a location which minimizes the effects of watercraft leaning. The inlet of the fuel pump desirably corresponds, in the lateral direction, with a position of an inlet to the jet pump unit. In this position, the pump is less likely to draw air as the watercraft maneuvers. The fuel lines also are arranged within the engine to minimize the effect of engine heat produced by the exhaust system on the fuel delivery lines. The arrangement of the fuel pump and fuel delivery lines consequently improves the consistency of the fuel/air ratio within the fuel charge produced by the engine as less air and vapor delivered to the fuel injectors.

Small watercraft

An improved fuel delivery and injection system for a small watercraft engine reduces the heat effects within an enclosed engine compartment upon a fuel pump of and the fuel within a fuel injection system. The fuel delivery system includes a vapor separator and a high-pressure fuel pump. The fuel pump is at least partially located within the vapor separator. The fuel within the vapor separator cools the fuel pump. The vapor separator also is positioned between a pair of air ducts such that an air stream between the ducts cools the fuel within the vapor separator. This arrangement consequently improves the consistency of the air/fuel ratio in the fuel charges delivered to the engine cylinders, provides a compact structure between the fuel pump, and the vapor separator and improves the durability of the fuel pump.

Watercraft fuel supply system

An engine mount for resilient mounting an internal combustion engine in a watercraft hull. The engine mount comprises a pair of cradle shaped members that are rigidly affixed to the front and rear underside of the engine and which are mounted at opposite sides of the engine on the hull by resilient cushions that permit resilient vertical movement of the engine relative to the hull.

Cradle type engine mount for watercraft

An engine assembly for powering a watercraft that has a front cover which contains a number of electrical components for the engine including the flywheel magneto of the engine, a CDI ignition system for firing the spark plugs and additional components. This permits ease of servicing and reduces the number and length of the interconnecting electrical conduits.

Growing community of inventors

Shizuoka, Japan

Naoki Katoh