| 摘要 |
PROBLEM TO BE SOLVED: To provide a saddle-riding type vehicular internal combustion engine, wherein a throttle body owned by an induction system connected to the rear side wall of a cylinder head is equipped with a throttle valve, wherein a drive motor unit having a drive motor and a reduction gear part is connected to the throttle valve, and wherein a tension lifter for adjusting the tension of a timing chain is so arranged in a cylinder body that its portion is protruded backward from the rear side wall of the cylinder body, so that the internal combustion engine is made compact by arranging the throttle body close to the cylinder head while avoiding the interference with the tension lifter.SOLUTION: A reduction gear part 52 and a tension lifter 72 are so arranged on the two sides of the vehicle width direction of an induction system 41 as to clamp an intake passage 48 inbetween.SELECTED DRAWING: Figure 4 |
