| 摘要 |
PURPOSE:To prevent the occurrence of out-cylinder burning during restarting right after the stop of an engine, by a useless ignition preventing circuit which is actuated by means of a signal from a sensor to detect the useless ignition timing of a magnet ignition type. CONSTITUTION:A sensor 25 is positioned facing a magnet 27 buried in one spot on the outer periphery of a disc 26 secured on a cam shaft 14, and a timing at which a magnet 27 is detected by the sensor 25 coincides with a useless ignition timing. A useless ignition preventing circuit 24 situated at a primary circuit 23 of an ignition device 22 receives a signal, by which a useless ignition timing is reported, from the sensor 25 to render the motion of a breaker 28 ineffective. Namely, the circuit 24 is connected in parallel to the breaker 28, and as a result of the circuit 24 bypassing the primary circuit 23 even when the breaker 28 cuts off the primary circuit 23, the motion of the breaker 28 is rendered ineffective, and no ignition current is generated at a secondary circuit 29. This constitution eliminates the possibility for out-cylinder burning to occur in any engine stop position and restarting position.
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