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Shut down engine

Switch turn to off can not shut down

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  • Eugene Rounds Dec 14, 2014

    Hi Yaoting pang, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?
    In order to help you troubleshoot your problem I need to know the make and model of your mower and possibly the engine numbers too.

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The anti backfire solenoid sticking opening doesn't prevent the engine from shutting as you are killing the output of the coil. It does however allows extra fuel into cylinder and exhaust which can create that backfire sound that most experiences on normal shut. The grounding of magneto is what shut downs the engine which in this can be as simple as broken wire to a bad magneto coil.

Posted on Dec 15, 2014

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Most engines hav an anti backfire valve solenoid screwed under the carb bowl. This sometimes sticks due to ethanol gas. When you turn off the ignition, it closes the valve to let the engin run out of fuel. If it sticks closed the engine will not start. Sticken open, the engine will not shut down. It has a single wire going to it. When you turn on the key, you should get power to the solenoid. If you have power to it, then remove the solenoid and clean the needle valve and carb opening. Would be a good time to clean carb also. A good carb cleaner works well. Ethenaol added gas is a real culprit to carbs nowadays.

Posted on Dec 15, 2014

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