Patent ID: 6764361
Filing Date: 2004-07-20
Classification: B63H,F01N,Y02T

Abstract:
A personal watercraft adapted to eject water from an outlet port to be propelled as a resulting reaction, comprising:a multi-cylinder four-cycle engine contained in an engine room and having even cylinders of four or more cylinders; a water jet pump being driven by the engine, for pressuring and accelerating the water; exhaust passages respectively connected at front end portions to exhaust ports of the cylinder; primary collecting exhaust passages connected to rear end portions of the exhaust passages, the primary collecting exhaust passages being each configured to collect two of the exhaust passages into one exhaust passage; a secondary collecting exhaust passage into which the primary collecting exhaust passages are merged; and an inlet port configured to introduce water to an inside of the primary collecting exhaust passages, the inlet port being provided at a rear end portion of each of the exhaust passages or a front end portion of each of the primary collecting exhaust passages.