| 摘要 |
Disclosed is a personal watercraft comprising an engine capable of achieving a high power without increasing the diameter of an output shaft where a crankshaft-side sprocket is attached, and thus without increasing the diameter of the sprocket. The engine is configured such that an extended shaft that is separable from the crankshaft and has a diameter smaller than that of the crankshaft is connected to one end portion of the crankshaft so as to be coaxial with the crankshaft, and a sprocket is provided on the extended shaft. With such a structure, by forming the extended shaft of a material having relatively high strength, the diameter of the extended shaft can be made smaller than that of the crankshaft, and hence, the diameter of the sprocket provided on the extended shaft can be reduced. Since the diameter of a camshaft-side sprocket can be reduced, the size of the entire engine can be reduced.
|
