Metal Particles on Spark Plug ?

Discussion in 'Motorized Bicycle General Discussion' started by Wheel Rush, Aug 26, 2008.

  1. Wheel Rush

    Wheel Rush New Member

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    I noticed a little thickened oil around the spark plug, took it off,
    of course it's a little oily looking, but looking closer tiny globules of oil revealed minute metal slivers, the bike is on its third gallon of gasoline mixture last two mixtures were;30:1, there seems to be the same within the cylinder, . .

    How common is this ?

    This may have occurred from the hour or so at first, start-up, with the marine mixture which was a slight mistake.
     
    #1 Wheel Rush, Aug 26, 2008
    Last edited: Aug 26, 2008
  2. stude13

    stude13 New Member

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    can you pick the particals with a magnet? if not it is probably the barrels coating.
     
  3. Wheel Rush

    Wheel Rush New Member

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    Hey Stude 13,

    I'm not really familiar with the barrel coatings, however a try with the magnet revealed no metal particles adhering to it. so, thanks Mon !
     
  4. Nitrohorse

    Nitrohorse New Member

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    There shouldn't be any metal particles on your spark plug. Metal particles are a sign of something is wearing in the engine.
    And a magnet will will only attract ferrous metals. Your particles are aluminum.
    You could have a broken ring that's "machining" a groove in the cylinder wall each time you start the engine.

    If it was my engine, I'd tear it down to see what's causing the metal particles.
     
  5. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    No doubt, if there's metal, there's a problem.

    Not sure if the liners are magnetic (nikasil) but it could be that, the bushing in the wrist pin, (bronze of sorts) or piston skirt (aluminum).
     
  6. Goat Herder

    Goat Herder Gutter Rider

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    Don't these engines have some sort of a nickle coating or somthing? I know this gig is soppost to be alluminum bore
     
  7. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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