Patent ID: 7878085

Claim:
A power unit comprising a crankcase formed at a lower portion of the power unit; said crankcase having an oil storage portion for collecting lubricating oil therein; an oil strainer provided in the oil storage portion; said oil strainer having a substantially flat plate shaped strainer element, and a strainer support bracket which extends substantially perpendicularly from the strainer element; a shaft member rotatably supported by the crankcase; and a biasing torsional coil spring disposed at one end of the shaft member with respect to a rotational axial direction of the shaft member; wherein the oil strainer is fixed to the crankcase through the strainer support bracket extending vertically relative to the strainer element, and wherein the torsional coil spring includes a coil portion wound around the shaft member, one end portion of the coil spring is retained on said one end of the shaft member, and the other end of the coil spring is retained by a retaining portion integrally formed with the strainer support bracket.