Your service manual’s wiring diagram will always be your best source of learning how your bike is built. Please note that these are general guidelines.
Here are the basic principles of how the ignition key stops the ATV and what components are involved in the circuit. In a case where the engine won’t shut off, there is usually an issue somewhere in this circuit that causes an electric signal to be sent regardless of the switch’s position. When you turn off the key or press the kill switch, it is no longer supposed to send a signal to the CDI or ECU. The Ignition key and killswitch are both parts of an electric circuit that, when active, sends an electric signal to the CDI or ECU, telling them to power the coil that then sends a high voltage charge to the spark plug. The spark plug will no longer ignite the fuel, effectively shutting off the engine. When you turn off the ignition key or hit the killswitch, the ATV should take away the spark. When you take away any of these elements, the engine will shut off. How the Ignition Key and Kill Switch Shuts off the EngineĪny gasoline engine needs three components to run fuel, air, and spark.
To support this presumption, let’s have a look at what the ignition key or kill switch does to turn off the engine. When faced with an issue like this, the problem is more often than not electrical. What may be causing this strange and potentially dangerous behavior? The bike may run as usual, but when you turn off the key or hit the kill switch, the engine keeps running. However strange it may seem, having problems shutting off the engine on an ATV is more common than you may think.
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