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Broken rings

Discussion in 'Engine modifications and repairs' started by Brian Andersen, 14 July 2014.

  1. Brian Andersen

    Brian Andersen New Member

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    Hi..

    My son bought a Suzuki Streetmagic with a 70cc Polini Cylinder kit on.
    It was driving fine for a couple of days, but then suddenly it would not go to high rpm's without going out.
    The sparkplug was completly black. We exchange it and was runing fine for a while, but then the piston rings suddenly broke. The psiton has burned oil on top, not carbon. Is it getting to hot ?? how to get temp down ??

    Thanks..
     
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  3. Bas

    Bas Administrator Staff Member

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    What kind of sparkplug do you use?
     
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  5. Brian Andersen

    Brian Andersen New Member

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    Ngk BPR8HS
     
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  6. Bas

    Bas Administrator Staff Member

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    Maybe you have tightened the cilinderhead with to much torque.

    But it's maybe better explainable if you could post an image of the piston and cilinder?
     
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