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  1. #1
    geetee's Avatar
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    gp1300r engine damage




  2. #2

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    is that a power valve motor?

  3. #3
    geetee's Avatar
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    npv motor 2006. I'm trying to figure out why that's happened

  4. #4
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    .
    Last edited by Rocketman; 10-09-2014 at 09:58 PM.

  5. #5
    That looks almost identical to the damage on my 2002 XLT 1200 powervalve engine. In my case it was the power valve touched the ring, causing the ring to break. I am in the middle of replacing the cylinder assembly on the #3 cylinder.

  6. #6

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    i agree with rocketman.. and you will not know the truth until you pull the cylinder.

  7. #7
    quadzilla's Avatar
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    Quote Originally Posted by geetee View Post
    npv motor 2006. I'm trying to figure out why that's happened
    Hey there..

    Agree that the piston ring locating pin has likely came loose and fell out..
    - allowing the ring to rotate and catch the exhaust port..!!
    (The evidence of this can be seen in your image where the ring has literally shaved a wide groove/gouge above the exhaust port. also can be seen what looks like the ring ends that correspond to the damage.)

    Your crank may well be ok.
    - the very least I would recommend, would be to remove it and inspect it, then clean it as all those little tiny bits of shrapnel you see lying around the top of your piston..
    will also have made their way down the transfer ports and will be in around your crankshaft..

    even "ONE" little piece will take out your crank if left down in there.!

    - Generally when a crank goes out it takes a LOT of shit out with it..
    think along the lines of..
    1/. crank cases.
    2/. crank (obviously)
    3/. piston and barrel (1 or more)
    4/. reed cage.
    5/. head damage

    I've also seen a starter motor nearly chopped in two from a sheared rod going round like a propeller
    the other side had the intake system seriously fucked up too.!
    Last edited by quadzilla; 09-25-2014 at 05:36 PM.

  8. #8

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    Agree with the spun ring diagnosis.
    Gouged out cyl wall above exhaust port is pretty conclusive.
    Read my post "Another Spun Ring" for details.
    Both times this happened to me the locating pin is still there but has worked its way up and allowed the ring to spin under it.
    In my case I will be inspecting my new oem pistons after 50 hours to see if they are coming loose again.

    Ceril

  9. #9
    Prism's Avatar
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    I agree with Kerry about the pin. Stock piston? How many hours? Is this the first failure for that cyl? Sometimes if the chamfer on the exhaust port was out of whack it will loosen the pin over time. The ring needs to expand and compress evenly as it bulges out over the wide exhaust port while running. If its not even, the ring pushes to the side repeatedly which works the pin loose. Dutch you may want to look at that when you inspect also.

  10. #10

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    I agree the ring did a lot of damage but there is quite a bit of burned piston on the exhaust port side and I doubt the engine ran that long after the ring snagged to cause the melted piston. In other words, perhaps the burned piston allowed the ring to catch.

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