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  1. #1

    The second piston

    Hi
    The valve hit the piston. Slit damage happened. Does it have to be replaced
    Click image for larger version. 

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  3. #3
    shrabber's Avatar
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    You dodged a bullet lol.... I can't see your bore that's the important thing you don't want any groves/scores on the walls at all. There's also a mark towards the edge of the piston what happens with motors I pull is it crushes the ring lands on the piston. But being the high head piston's the seadoo's have I would say Your fine and the only way to tell is to reassemble head and do a leakdown and compression test at this phase. Looks like the valve did not break off and ping pong in the cylinder or if it did the motor immediately shut off. I bring the pison to TDC blue tape the bore to piston edge( this keeps any metal particles filings etc from getting into the cylinder/motor) . Then take three stage steel wool and clean up top of piston. Just make sure the contact points are filed down to where they have no change of breaking off and ping ponging.

    here's a picture of a heavily smashed ring lands. There are cases where I have seen just a small ding in a top of piston crush a land but until you pull the piston you won't know.
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  4. #4
    What Shrabber said is spot on...... Those last few hard hits on the OD of the piston is what to worry about. If it presssed down on the ring land area it bites the Top ring and holds it there. The Top Ring even though it is compressed in the cyl bore Must be Free to Move and adjust itself.. This will cause a problem very soon after the engine gets put back in service if it cannot.. If you plan to keep it? it would be Wise to inspect that piston & Know the cond of the ring land & Rings ability to move.. You can easily buy a Good used piston on Ebay. if you do not wish to replace it with new?? If you had a valve failure that effected the intake & exhaust Valves? Check & Double check the Intake Assembly for lost Small parts & pieces... Do Not assume it is OK?? Pull the intercooler Out & clean it all... Hope this helps make a good repair......

  5. #5
    Bob 1tommygunner1927's Avatar
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    If that were my engine I'd first fix the cause, then repair!

  6. #6
    Boost addict hotbird's Avatar
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    I had a similar happening. I was able to smooth the top of the piston and go.
    Depends on the damage.

    Mine happened about 5 hours on new SBT valves. Go with OEM or Supertech!!

  7. #7
    Boost addict hotbird's Avatar
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  8. #8
    Boost addict hotbird's Avatar
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    This was on My 06 RXT

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