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  1. #1

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    '99 GP1200 - Newbie looking for advice!

    I originally posted this in the "How To & FAQs" section, but then figured out that it should really go here.

    I've got a '99 GP1200 that's really clean and low hours (~65). Only problem is that the oil line for the center cylinder came loose at the pump and I didn't know it until it shut down. Apparently the overtemp sensor kicked in, because it died like pulling the kill switch. When pulled the seat I saw the oil in the bottom of the hull. No more injection for me, but hindsight is always 20/20.

    The compression on the two outside cylinders is around 105 psi, but the center is 55.

    I'm thinking of taking this repair on as a pet project, but I've never done anything on this big of a scale. Seems like it could be a fun project and I'm not in any hurry. I'm just wondering if there is any sort of guide available for this kind of thing. Starting from what needs to be done to assess the damage all the way through the rebuild process. Am I looking at just a piston replacement, a whole top end, or what? Any advice or guidance? What should I do first? This rookie could use some good advice. Thanks!


  2. #2

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    sounds like you need to go ahead and have a new top end. the other 2 cyl. are low.

  3. #3
    crashhard's Avatar
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    sounds like a hole in the cases. Pull the motor and start from there.

  4. #4

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    I don't think I have a hole in the case , but I guess I just need to tear into it and see what I find. as soon as I ge the time to do that I'll probably post some pics and look for more advice. Thanks.

  5. #5
    pilo704's Avatar
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    this is not good definitly sounds like a new top end

  6. #6
    Dave Sharp dav_dman's Avatar
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    get a service manual. I'd get one for a 98 xl1200.. osidebill says it's more complete in the elec sections. Same engine/pump/elec as the gp1200

  7. #7

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    Thanks for the inputs. Does anyone have a quick link for the '98 XL1200 manual? I have the manual for the '99 GP, but if the other one has some better info....

    Now all I need is some time to tear into it. Too many things going on right now!

  8. #8

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    Quote Originally Posted by Ski Monkey View Post
    Thanks for the inputs. Does anyone have a quick link for the '98 XL1200 manual? I have the manual for the '99 GP, but if the other one has some better info....

    Now all I need is some time to tear into it. Too many things going on right now!

    One the second Yamaha page....

    http://www.mediafire.com/ServiceManuals

  9. #9
    You could do a pressure test.. kinda like a leakdown.. blow air into the piston that is low.. to see if you can hear or feel where the air is coming out. Redoing a wv1100 currently and I could feel the air WHOOSHING out the bottom case where the rod had popped out. Be careful as when you do this it will turn the crank a little bit but (just saying dont have your hands on things when you first start some air into it.

    You should either hear the air going out the exhaust or the intake. but not out of the case... Hope that made sense.

    BTW I MISS MY GP1200 it was a screamer across the lake you could hear it over most anything!! LOL and I bought that ski for dirt cheap....
    Last edited by mstbone67a; 06-22-2009 at 08:57 PM. Reason: content

  10. #10
    Flying Scotsman's Avatar
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    Quote Originally Posted by Ski Monkey View Post
    I originally posted this in the "How To & FAQs" section, but then figured out that it should really go here.

    I've got a '99 GP1200 that's really clean and low hours (~65). Only problem is that the oil line for the center cylinder came loose at the pump and I didn't know it until it shut down. Apparently the overtemp sensor kicked in, because it died like pulling the kill switch. When pulled the seat I saw the oil in the bottom of the hull. No more injection for me, but hindsight is always 20/20.

    The compression on the two outside cylinders is around 105 psi, but the center is 55.

    I'm thinking of taking this repair on as a pet project, but I've never done anything on this big of a scale. Seems like it could be a fun project and I'm not in any hurry. I'm just wondering if there is any sort of guide available for this kind of thing. Starting from what needs to be done to assess the damage all the way through the rebuild process. Am I looking at just a piston replacement, a whole top end, or what? Any advice or guidance? What should I do first? This rookie could use some good advice. Thanks!
    Top end repair is your minimum possible damage.
    Crank could be shot and cases could have a hole in them.
    You are going to pull the motor to do the top end anyway so just yank the motor and go from there.
    Pressure test it after its out to make sure the cases are sealed good if it tests good ten pull the top end and look inside the cases at the crank.If you see rust heat marks etc pull the crank and replace .
    Post pics of everything
    Top end damage can be determined after pulling.
    You know why it seized on you so you just need a good rebuild.
    Carbs should be inspected and or rebuilt regularly now might be a good time to do that also.

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