| 摘要 |
A small-sized vehicle such as scooter-type motorcycle includes an engine unit and a power transmission unit coupled to the engine unit to be swingable. The engine unit includes a power generation section, a speed changing section, a first case into which the power generation unit is accommodated and a second case into which the speed changing section is accommodated. The first and second cases are operatively connected to each other as a unit case constituting the engine unit, which is then mounted to a vehicle body.
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