Patent ID: 8886442

Claim:
A water jet propulsion watercraft comprising: a hull; an engine installed in the hull, the engine including: a combustion chamber arranged to combust fuel therein; an exhaust port arranged to discharge exhaust gas after combustion of the fuel in the combustion chamber; an exhaust valve arranged to open and close the exhaust port; an intake port arranged to pass air and the fuel into the combustion chamber; and an intake valve arranged to open and close the intake port; wherein the engine is arranged to operate so as to have an overlap period where the exhaust port and the intake port are opened simultaneously; a jet propulsion device arranged to be driven by the engine to draw in water from around the hull and then jet the water; a fuel injection apparatus arranged to inject the fuel into the intake port; an exhaust channel connected to the exhaust port and arranged to discharge the exhaust gas from the exhaust port; a detection unit arranged to detect whether or not the intake valve closes the intake port and whether or not the exhaust valve closes the exhaust port; and an engine control unit arranged to control the engine in a state where a fuel injection amount of the fuel injection apparatus is set lower than an ordinary fuel injection amount only during a predetermined period when starting of the engine is performed and the detection unit detects an overlap state in which both the intake valve and the exhaust valve are stopped at positions of respectively opening the intake port and the exhaust port.