Patent ID: 8121775

Claim:
A misfire detecting device for a water jet propulsion watercraft having an engine and a jet pump operated by the engine to propel the watercraft, the misfire detecting device comprising: a fuel injecting device arranged to inject fuel into the engine under a fuel injection amount adjusting control performed by a fuel injection control device; an igniting device arranged to ignite the fuel injected into the engine from the fuel injecting device to operate the engine; a misfire control device arranged to stop the igniting device from firing the fuel when a predetermined misfire condition is satisfied; a misfire detecting device arranged to detect that a misfire occurs in the engine; a misfire indicating device arranged to indicate that the misfire has occurred when the misfire detecting device detects an occurrence of the misfire in the engine; and an indicating inhibiting device arranged to inhibit the misfire indicating device from providing an indication that the misfire has occurred if the misfire detected by the misfire detecting device is a misfire caused by a control operation performed by the misfire control device.