Patent ID: 7364481
Filing Date: 2008-04-29
Classification: F02M,Y02T

Abstract:
1. A jet-propelled watercraft which discharges a water jet using an engine, obtains a propulsion force from the water jet, and controls turning by changing a direction of the water jet, comprising: an intake pipe for supplying air to the engine; a throttle valve which is provided in the intake pipe and adjusts an amount of the air; an auxiliary intake passage which is connected to the intake pipe and provides bypassing of the throttle valve; an auxiliary intake valve which opens and closes the auxiliary intake passage; a rotation speed sensor which detects a rotation speed of the engine; and a control unit which controls opening and closing of the auxiliary intake valve, wherein the control unit performs control such that an opening of the auxiliary intake valve in a state where the rotation speed detected by the rotation speed sensor is not lower than a prescribed threshold value is larger than the opening of the auxiliary intake valve in a state where the engine is idling.