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Fouling Spark Plugs

There are only two things I can think of that cause spark plug fouling:

  • The fuel mixture is way too "rich."
  • The "oil" rings on the piston are worn, allowing crankcase oil to get past and above the piston into the combustion chamber.
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βˆ™ 14y ago
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Q: Why the bike foul the spark plug?
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