Throttle-valve control apparatus for spark-ignition two-cycle engines
 A throttle-valve control apparatus is provided for allowing switching from an ordinary-combustion state to an AR-combustion state or vice versa to take place with ease in an AR-combustible spark-ignition two-cycle engine wherein, at least during a light-load operation, a compression-start pressure is properly controlled in order to let fresh air in a combustion chamber self-ignite so as to undergo active thermal atmosphere combustion. A throttle drum is linked to a throttle grip through a wire. The throttle drum is also linked to a throttle valve through a linking mechanism. An arm forms a single body with the throttle drum. An adjustment screw is fixed at the end of the arm. A cam is supported at such a location that the cam can be brought into contact with the adjustment screw. A pulley forms a single body with the cam. A cable which is wound around the pulley is linked to a throttle-valve servo motor. In ordinary combustion ignited by spark ignition, the cam is erected, preventing the throttle opening rate .theta..sub.th of the throttle valve from decreasing to a value smaller than, typically, 17%. 
Honda Giken Kogyo Kabushiki Kaisha
Y F F F F F F F F F F
Y02T F02D F02D F02D F02B F02D F02B F02D F02B F02B F02B
additional additional inventional inventional additional additional additional inventional inventional additional inventional
Shoji Masahiko Yoichi Shinichi Yoshiyasu
Masuda Abe Ishibashi Wakabayashi Uchida