Patent ID: 9056664
Filing Date: 2015-06-16
Classification: B63H,F01N,F02B

Abstract:
1. A water jet propulsion watercraft comprising: a hull; an engine housed in the hull, the engine including a plurality of exhaust ports; a jet propulsion unit arranged to be driven by the engine and configured to draw in water from around the hull and jet the water out; an exhaust passage configured to guide exhaust gas from the engine to an exterior of the hull; a catalytic converter unit including a catalyst member arranged in the exhaust passage; a water lock arranged in the exhaust passage downstream of the catalyst member; a first oxygen sensor arranged in the exhaust passage upstream of the catalyst member; and a second oxygen sensor arranged in the exhaust passage at a position downstream of the catalyst member and upstream of the water lock; wherein the catalytic converter unit is arranged at approximately a same height as the plurality of exhaust ports; the exhaust passage includes a first pipe body arranged to face a side surface of the engine and configured to extend in a longitudinal direction of the watercraft; and the first oxygen sensor or the second oxygen sensor is arranged at a position higher than a widthwise oriented centerline of the first pipe body and closer to the engine in a widthwise direction than a vertically oriented centerline of the first pipe body when the first pipe body is viewed in a cross-section perpendicular to an axial centerline of the first pipe body.