Patent ID: 6341659
Filing Date: 2002-01-29
Classification: B62K,F02B,F02F

Abstract:
A power unit for a two-wheeled vehicle coupled in a freely swinging manner to a vehicle frame, said power unit comprising:an engine; a crankcase being integrally attached to said engine; a crankshaft disposed within said crankcase and being laterally arranged with respect to said engine, said crankshaft having a plurality of cranks attached to first and second pistons, respectively, said pistons being positioned in first and second cylinders; a transmission case extending rearward from said crankcase, said transmission case axially supporting a rear wheel at a rear end part thereof; and a transmission housed in said transmission case coupling the crankshaft of said engine and the rear wheel, wherein said crankcase is divided by a partitioning surface offset from a central position between said first and second cylinders thereby forming first and second crankcase halves.