| 摘要 |
<p>A breather chamber (20) is provided at the rear end of a crank case (9) such that it protrudes upwardly. A vehicle speed sensor (17) detects the rotation speed of a main shaft (12) as a vehicle speed, and is fitted in front of the breather chamber (20) at an upper section of the crank case (9). Accordingly, as compared to a case where the vehicle speed sensor (17) is attached to a rear wall of the crank case (9) such that it protrudes rearward, the front-rear length of an entire engine (E) can be reduced. Further, because the vehicle speed sensor (17) is interposed between the breather chamber (20) and a cylinder (1) or a starter (11) standing in front of the vehicle speed sensor (17), it is simply protected from flying stones etc.
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