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Over time some of the ingredients in the fuel may evaporate leaving behind a thicker stickier substance. Sometimes the starter system could also be a problem. Loose Dirty or Disconnected Spark Plug in Your Lawn Mower.
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You should periodically check your air filter and keep it clean. Fuel and a spark. Loose Dirty or Disconnected Spark Plug in Your Lawn Mower. Dont turn the mower so that the carburetor and air filter face downwards as engine oil can foul the carb and filter leading to difficulty in starting.
