This Kawasaki generator must run at a relatively high speed, so that it can generate electricity at the correct frequency. This means that when the engine is stopped, the momentum of the engine will keep it turning over for a significant period of time. During this time, there will be no spark, but the piston will continue to draw in air and fuel.
Because this fuel is not being burnt, it can make its way down the cylinder walls and into the crankcase, where it will dilute and pollute the engine oil. As well as that, much of the fuel will find its way into the exhasut and out into the atmosphere as excessive HC emissions.
In order to avoid this, when the generator is shut down, the off switch, as well as grounding the primary ignition circuit will also supply this valve with electricity. This supply will be maintained as long as the ignition system has been shut down and the engine is turning under its own momentum.
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