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Piston health

Discussion in 'Maintenance' started by Frankster, Feb 24, 2016.

  1. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    1. What causes this kind of pitting on the piston face?
    2. Should bearings line up (sorry for the blurry pic)?
     

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  2. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    1, water corrosion.
    2, not always. So long as they are located properly in the 'tang' it should not be a problem.
     
  3. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    That piston looks like something got into the bore and started bouncing around. Spark plug electrode perhaps? A broken piece of valve? Who knows.
     
  4. KICKERMAN360

    KICKERMAN360 Well-Known Member

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    What's the head like? Equally as pitted?
     
  5. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    I think Murdo nailed it. The top 20mm of the bore looks like it has been eaten away. I'm guessing the PO might have left this engine out in the weather and water has found its way in their. There was no spark plug in the head, so who knows for sure. I'm guessing this is junk and the bore is too? This is a VT250F engine and I don't think you can bore these out. I might try and take a pic of the bore and post it to see what you guys think.

    Thanks
     
  6. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Thanks Murdo.
     
  7. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Have seen enough aluminium corrosion to last me several lifetimes when I worked on aeroplanes back in late 1970's to '80's.
     

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