Sanshin Kogyo Kabushiki Kaisha

Yamaha Marine Kabushiki Kaisha

Takeshi Hirasawa

Tetsuya Mashiko

A multiple valve engine for a watercraft includes an improved construction that contributes in balancing the weight of the engine between the port and starboard sides of the watercraft hull. The hull defines a center plane extending generally vertically from bow to stern. The engine includes a cylinder body defining at least one cylinder bore. An axis of the cylinder bore is inclined from the center plane. At least two intake passages communicate with a combustion chamber. Intake valves are arranged to selectively connect and disconnect the intake passages with the combustion chamber. At least one exhaust passage communicates with the combustion chamber. In one mode of the invention, the number of exhaust passages in the engine is less than the number of intake passages. At least one exhaust valve is arranged to selectively connect and disconnect the exhaust passage with the combustion chamber. The intake valves lie closer to the center plane than does the exhaust valve(s).

Multiple valve engine for watercraft

A lubricant filter mounting structure for a internal combustion engine includes a lubricant filter mounting surface and a catch member. The lubricant filter mounting surface is positioned at an angle with respect to a vertical plane, and the catch member is mounted at least partially directly below a lubricant filter. At least a portion of the induction system and at least a portion of the exhaust system is removeably mounted to the engine to enhance access to the filter, especially within the confined engine compartment of a personal watercraft.

Lubricant filter mounting structure

An improved propulsion unit for a watercraft embodying a reciprocating internal combustion engine having horizontally disposed cylinders so as to provide a compact assembly. The engine operates on the two-stroke principle and the exhaust manifold for the engine is disposed beneath the engine to achieve further silencing.

Growing community of inventors

Shizuoka, Japan

Takeshi Hirasawa