| 摘要 |
[Object] To provide a compact power unit while securing a sufficient clearance between a stud bolt and a fixing shaft of a cam chain tensioner pivot mechanism, and surely supporting a cam chain tensioner guide. [Solving Means] In a power unit including a crankshaft 30, a stud bolt 26 configured to fix a crankcase 22 and a cylinder body 23 to each other, a cam chain 52, a cam chain tensioner mechanism 60 including a cam chain tensioner guide 61, and a cam chain tensioner pivot mechanism 70 including a pivot plate 71, a fixing shaft 72, and a swinging shaft 73, the fixing shaft 72 and the swinging shaft 73 are arranged so as to straddle the axis L2 of the stud bolt 26 as viewed in the axial direction of the crankshaft 30. |
