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  1. #1

    Join Date
    Jun 2008
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    Sudbury, Ontario
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    Angry 99 Genesis piston diagnosis

    This was my first rebuild done last year. The ski had a broken cylinder on the drive end, new crank, seals, gaskets, cylinders were done at a shop .25mm that is very reputable. The ski ran great for 2 weeks, borrowed it to a friend!!! This is whats left. Any insight would be appreciated. I have the engine out and torn down, new cylinder and piston set. Crank is ok. The good cylinder is the middle one, the front is the same as the middle.
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  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Jul 2007
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    Is it possible the engine ingested water?

    Looks like lots of metal bits embedded into the piston top. I expect the cylinder head has similar damage.

    The question is - is the metal shrapnel just from the piston itself, or from the connecting rod bearings?

    Is there any play in the connecting rod bearings on the crank? Any damage to the rod?

  3. #3

    Join Date
    Jun 2008
    Location
    Sudbury, Ontario
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    piston

    there is no damage to the crank or rod bearings, I think there was a piston, ring failure and the piece of the piston that broke off became trapped between the piston and the head and caused the hole. The head is banged up as well, The chance of water i guess is always there, I followed the manual to a T when rebuilding. The orings all look good. There is some material just above the exhaust port that looks like its from the piston.

  4. #4

    Join Date
    Jun 2008
    Location
    Sudbury, Ontario
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    Shrapnel looks like its from the piston ring itself, there are pieces embedded in the piston.

  5. #5
    seaobin's Avatar
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    Jun 2007
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    Raleigh, North Carolina, United States
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    Mine did the same thing

    ended up being thast i did not blend the edge of the exhaust port after boring adn honing. Ring caught and chunked a part out of the piston edge.

    But that piston crown looks like it burned. White color means really hot

    you might have leaned way out and seized the piston slightly before the engine blew up

  6. #6
    Rasta Mon Condoms We Be Jammin!!!!! TxPro1200's Avatar
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    Aug 2006
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    313

    carbed

    is it carbed???if so check the internal carb screens and replace all the grey fuel line.

  7. #7

    Join Date
    Jun 2008
    Location
    Sudbury, Ontario
    Posts
    109
    It is carbed, I wasn't riding it to see how it blew....I have purchased 3 new carb kits. Could it have overheated???

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