| 摘要 |
PROBLEM TO BE SOLVED: To reduce the reverse flow of fuel, intake noises and engine noises by jointly arranging throttle bodies each of which has a throttle valve in the upstream side of a reed valve unit and by mounting an intake silencer 46 to the throttle bodies. SOLUTION: An internal combustion engine 11 has a crank case 40 and a cylinder body 41 which are common to each cylinder and an intake passage 81 is formed which communicates with every crank room 80 of each cylinder which is formed by the crank case 40 and reed valves 82 are mounted in the intake passage 81. A throttle body 45 is connected to the upstream side of the reed valve 82 and an intake passage 45a communicating with the intake passage 81 and a throttle valve 45b for controlling an intake air amount are mounted and an intake silencer 46 is mounted to the throttle bodies 45, which can reduce the reverse flow of fuel, intake noises and engine noises. |
