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What could cause a spark plug to get mashed and another not in the same cylinder head? 1969 20hp johnson.

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What could cause a spark plug to get mashed and another not in the same cylinder head? 1969 20hp johnson.

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  1. You have a streached rod. Also not all pistons are created equal. Make sure you have the correct "shorty" threaded spark plugs. If you still have a problem-consider a replacement. Was it knocking when it ran last?


  2. Likely a faulty plug.  
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