NotTaR of small Gasoline Engines and Rotary Lawn Mowers : Suppose it fails to stop?               
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Suppose it fails to stop?

What should you do if the engine stop switch has no effect? Probably the safest and surest is to use a wooden stick to pop the spark plug connector off of the spark plug terminal. This WILL stop the engine.

The most likely cause of such misbehavior is a stop wire that has become disconnected or has broken. This is easily remedied.