2003 Honda CR 125 R Logo
Posted on Apr 06, 2009
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Bike bogged down like plug fouled now wont start

Riding fine bogged down like a fouled plug pulled old one out the top of the plug which makes the spark was melted and looking in the plug some of it is gone.i put a new plug in it has spark but not starts

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  • honeymoney30 Apr 08, 2009

    Took it apart and the piston looks like it was beat with a hammer and chisel. Piston looks black as coal. Thanks you was right on the money.

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1 Answer

tombones

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  • Master 3,567 Answers
  • Posted on Apr 07, 2009
tombones
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Based on the information given, I think you may have a hole in the top of the piston. It sounds like pre-ignition, ( AKA detonation and engine knock ). Pull the cylinder head and check the piston and cylinder head. Sometimes the top outer edge of the piston disintegrates due to the heat. Replace the piston and rings and remove the carbon from the head. Be sure you run 32/1 mix on gas and oil. That's 4oz two stroke oil per gallon of gas. Only use premium gas.

Remove and clean the carb. Be sure the carb mount bolts and carb manifold bolts are tight. An air leak will cause the engine to run hot.

Please rate this solution. Thanks

  • tombones Apr 08, 2009

    Could I get you to rate my answer? I am trying to hit 100 correct answers and I am only 4 away.

    A Four diamond rating would leave me only three to go. Thanks!

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