Patent ID: 8753157

Claim:
A water jet propulsion boat comprising: a watercraft body; an engine accommodated in the watercraft body; and a jet pump section driven by the engine; wherein the engine includes: a crankshaft; a crankcase arranged to support the crankshaft; an oil pan arranged below the crankcase; an oil suction tube including an oil suction port arranged inside the oil pan; an oil pump arranged to draw oil from the oil suction port, the oil pump being connected to the oil suction tube; a main chamber rib arranged to divide an interior of the oil pan into a main chamber where the oil suction port is located and an auxiliary chamber outside of the main chamber, the main chamber rib bordering the oil suction port from at least a front side and left and right sides of the oil suction port, and projecting upward from a floor of the oil pan; and a first opening through which oil passes provided in the main chamber rib at a location only rearward from a rear edge of the suction port of the oil suction tube; wherein the main chamber and the auxiliary chamber communicate with each other through the first opening.