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  1. #1
    Water4fire's Avatar
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    Info needed for a 97gp1200

    Guys I was given a gp1200 that is in dam near mint shape. The original owner had taken it to woods fun center in Austin and said two oil lines came off and both front cylinders had 70p.s.i... Since they said $3000 to fix it he gave it to me. 90 hours and very good to mint shape.
    I want to fix it for anyone comming to our lake house to have a beater ski to ride besides my $15,000 dollar ski's.

    Anyway I have confirmed oil lines off and two bad cylinders.

    Questions:

    1. Our theses the Ni cylinders or can I just bore and go?
    2. Were to get good pistons.
    3. Any info that I need to know?
    4. Info on inspecting crank? Make sure it turns smooth?
    5. Just any all around help would be nice. I have built many seadoo 2strokes so I am not a stranger, but this is a Yami.

    Thanks in advance and going to shoot my Bow.

    .


  2. #2

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    Just bore them out not nikasil. Clean out crank case well.

  3. #3
    Water4fire's Avatar
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    Just pulled the air intake off and is this really were the oil lines connect to the carbs? On the plastic intake?

    .

  4. #4
    cheatin' piston popper addicted's Avatar
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    Quote Originally Posted by Water4fire View Post
    Questions:

    1. Our theses the Ni cylinders or can I just bore and go? Just bore & hone
    2. Were to get good pistons. pro-X pistons, IMO.
    3. Any info that I need to know?
    4. Info on inspecting crank? Make sure it turns smooth? Check it real close. If the oil lines popped off, the crank wasn't getting oil either. While your in there, replace the main seals for peace of mind.
    5. Just any all around help would be nice. I have built many seadoo 2strokes so I am not a stranger, but this is a Yami. same concept, except no rotary valeve, and this motor will last hundreds of hours if you feed it enough gas and oil

    Thanks in advance and going to shoot my Bow.

    .
    see red. also, should put this in the old school section

  5. #5
    Water4fire's Avatar
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    Thank you, I will have it on the work bench in the the next week or two and then I will take it down to my old bud that did my 2stroke pistons.

  6. #6
    Water4fire's Avatar
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    Ok, since my motor for my conversion is at the machine shop I couldn't just sit around, so I pulled this top end on this gp1200. Pics bellow.

    Guys is it me or do ya'll also think I just need a top end and carb clean with new oil lines and be done with it?

    What do you all think?

    PICS
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_3130.JPG 
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Size:	1.02 MB 
ID:	159576  

  7. #7
    Water4fire's Avatar
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  8. #8

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    Smile

    +1 pro x pistons and rebuild carbs while it's apart.

  9. #9
    cheatin' piston popper addicted's Avatar
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    it obviously needs a bore and new pistons. crank doesn't look like it got too hot, so if you are happy with the way it looks and feels, go for it. Just inspect it very carefully. if you see any shrapnel in there, split the cases, flush it out and thoroughly inspect it. definitely rebuild the carbs too.

  10. #10
    Water4fire's Avatar
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    Quote Originally Posted by addicted View Post
    it obviously needs a bore and new pistons. crank doesn't look like it got too hot, so if you are happy with the way it looks and feels, go for it. Just inspect it very carefully. if you see any shrapnel in there, split the cases, flush it out and thoroughly inspect it. definitely rebuild the carbs too.
    I totaly agree, and I would for sure split the cases if it appeared that it got hot and had crap everywhere from the pistons but it just looks as the oil lines came off it stuck the 2 pistons and he shut it off as it was running like shit. The cases and all look real good. I just like some opinions to let me know I am on the right track or not.


    .

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