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Q: Spark plug popped-out

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Spark plug number four popped out.

It is common on this engine for the spark plugs to pop, and there are two typical fixes: either the spark plug hole could have a new insert put into it, or the head will have to be replaced. I recommend that you have a mechanic, such as one from YourMechanic, inspect your spark plugs, and replace them, if necessary.

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