Yamaha Hatsudoki Kabushiki Kaisha

Makoto Kawamura

Kenichi Sakurai

A multi-valve manifold injected internal combustion engine. The fuel injector has a spray pattern that is directed primarily toward each of the intake valve seats. An air control system is incorporated, however, that directs the airflow primarily toward the center intake valve seat under some running conditions so as to improve fuel stratification.

Fuel injected multi-valve engine

A fuel injection system for a multi-valve internal combustion engine that includes an arrangement for controlling the fuel spray in response to engine load and speed. As a result, it is possible to obtain stratification under low-speed, low-load conditions and a homogeneous mixture under high-speed, high-load conditions.

Growing community of inventors

Iwata, Japan

Makoto Kawamura