| 摘要 |
PROBLEM TO BE SOLVED: To smoothly perform engine start-up by gas fuel by making a throttle valve into the gas start-up suitable attitude having the specified opening in engine start-up by gas fuel. SOLUTION: A valve opening setting lever 17 is provided outside a mixing body 2, a receiving part 18 is provided on the valve opening setting lever 17, the valve opening setting lever 17 is switched to the gas start-up setting attitude 19 and the gas start-up releasing attitude 20. When the valve opening setting lever 17 is switched to the gas start-up setting attitude 19 and a throttle input lever 21 is received by the receiving part 18, a throttle valve 22 is made to the gas start-up suitable attitude 24 having the specified opening 23. |
