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  1. #1
    christian gpr's Avatar
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    Crank, piston and cylinder failour

    Engine started loosing power fast then finaly refuged to turn over. Now I have the engine out and I realise that the crank is shot at the middle cylinder + the middle piston and cylinder is a waste to. Does anyone have any idea what could have caused this.
    The ski is a Gpr1300-04 70 hours with some mods the latest installed 30 min before the failour was the keyway 3*
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  2. #2
    Hydrotoys's Avatar
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    Christian,
    Verify you didn't lose oiling on that cylinder, or suck in water...but it looks like an out and out crank bearing failure.

    the gpr crank is a known issue. As the years go by, and the newer skis get a few hours on them, everyone is slowly realizing that not much has really changed since 2000... IMHO.

  3. #3
    christian gpr's Avatar
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    Mark I run premix since my last piston+cyl. failour. I havnt seen any water in there. When the crank break does the piston and cylinder always get damaged too? From what I have read its the same crank from 2000 and up? Should be easy to find a good used one then. This ski is going back together bone stock and then sold. I will have enough on my hands when my trippel pipe ski gets here.

  4. #4
    Hydrotoys's Avatar
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    When a crank SNOUT breaks, usually no damage to the cylinder and head.

    When a crank bearing dies, it takes everything aluminum with it... including your head, piston and cylinder.

  5. #5

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    is it possible that the keyway added too much timming and tried to stick a piston? This resulted in beating the rod bearing out of the crank?

  6. #6
    christian gpr's Avatar
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    I remember reading something about that you should upp your high speed setting on the efi when installing the keyway, well I forgot and left it on 2 maybe it got lean and overheated seizing the piston? On the other hand the other to sparkpluggs looked good. Maybe just tuff luck and a normal crank bearing failour as you suggested Mark.

  7. #7
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by christian gpr
    I remember reading something about that you should upp your high speed setting on the efi when installing the keyway, well I forgot and left it on 2 maybe it got lean and overheated seizing the piston? On the other hand the other to sparkpluggs looked good. Maybe just tuff luck and a normal crank bearing failour as you suggested Mark.
    I raised my high speed when I first installed the key. It actually didnt need the fuel, so I put it back where it was. Plus you would think it would effect all cylinders.

  8. #8
    christian gpr's Avatar
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    Rich, I think you are right, sorry to rush you to send the Keyway here so I would get it in before the race. As it turned out I put it in and the ski ran great for 30 minutes. I drove to the race (9 hours one way) and the ski broke down on my second practice lap. All that rushing for nothing.

  9. #9
    Happily Self-Employed WFO's Avatar
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    ......Damn

  10. #10
    Flying Scotsman's Avatar
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    Looks like heat took away your oil barrier.
    Did you increase your occtain to compensate for the advanced timing.
    Did you do plug chops when tunning.
    SCOTT...........

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