| 摘要 |
PURPOSE:To stabilize the operating condition of controlling-system and/or charging-system electric circuit by forming earth circuits for said controlling-system and charging-system electric circuit at a part except an engine body and electrically separating it from an earth circuit for ignition-system electric circuit. CONSTITUTION:The earth terminals 11E, 12E for a high voltage generating part, i.e., a CDI circuit 11, and for an ignition coil 12, are connected to a different part of an engine body from the earth terminal 18E for an ignition plug 18, in an ignition-system electric circuit 10, and minute resistance caused by a bolt, packing, painting, etc. exists between both earth terminals. Therefore, if a large volume of current of the ignition-system electric circuit flows in both of the earth circuits, a voltage drop takes place between these circuits. However, since the earth circuits for the ignition-system electric circuit 10, a control-system electric circuit 20, and a charging-system electric circuit 30 are electrically separated from each other, any occurrence of voltage drop in the ignition-system electric circuit 10 will not affect the operation of the circuits 20 and 30, stabilizing the operating condition of these circuits. |
