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  1. #1

    Join Date
    Apr 2013
    Location
    Chicago il
    Posts
    16

    gp1200r engine rebuild , need help/advice

    Hey guys ,
    I took the engine a part and have few questions about few things, i searched the forum for over 10 hrs but i am still confused. I will be getting used cylinder and honing all 3 cylinders and instaling new pistons rings, bearings etc, but i need to find out why i toasted the cylinder.
    I appreciate all your help.!!

    1) I still cant find out what caused the cylinder #3 to go bad.
    - i did the engine presure test using instruction from How To & FAQs and. it held the pressure
    - oil lines were all connected(switching to premix )
    - bearing on the crank look all good to me
    What to look for in carb and pv that could cause cylinder to go bad? What alse should i check?

    2) Should the bearing move like this? (see pics)

    3) In the crank case there was water/oil mix , should it be there?

    4) How to check reeds for proper operation?

    5) Is it save for the bearings to spray whole crank with some cleaner/degresser ?

    6) There was a lot of sand in the water passages, is it normal, maybe the passsages were blocked on cylinder #3 and it just overheated?

    7) What schould i check/replace while i got the engine a part? new seals on the crank?

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    Last edited by m4c13k; 04-24-2013 at 11:10 AM.


  2. #2

    Join Date
    Apr 2013
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  3. #3

    Join Date
    Apr 2013
    Location
    Huntersville NC
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    I am doing the top end rebuild on my 2000 GP1200R this week. (First time doing this) I had a center cylinder go out. I didn't plan on pulling the bottom end. I inspected the crank and case and found no debris or scoring from what I can see with out taking it apart. My Piston looked about like the one you have pictured. I can tell that mine happened from oil starvation. There was no oil in center cylinder or middle part of the crankcase when I pulled the top end off. I was wondering if I should be concerned about the crank and its lack of oil in the center cylinder if there appears to be no damage from my visual inspection?

    Back to some of your issues...I would say the sand came from someone beaching before shutting the engine off. As for it clogging some of your water ports that is a possibility. I would also say that having water in the crank is most defiantly a bad thing.

    I know I am not much help with your questions...I am new to this and in the same plaI would like to see some of the answers to your other questions.

  4. #4
    Happily Self-Employed WFO's Avatar
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    looks like the ring jumped over the locator pin and spun around and hooked the exhaust port

  5. #5

    Join Date
    Apr 2013
    Location
    Chicago il
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    "should be concerned about the crank and its lack of oil in the center cylinder if there appears to be no damage from my visual inspection?"
    After u take off ur cylinders u can lift the rest of the engine , i am not a specialist but i would spend extra 2 hours and inspect/clean the crank.
    .

  6. #6
    Banned User
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    #3- crankcase shouldnt have water in it
    #5- yes thats fine just make sure you dry it real good and oil it back up. i hosed mine down with a bottle of wd40
    #6- if your riding in sandy lakes but thats not good. running ski in too shallow of water and sucking up sand.
    #7 use new oem gaskets and oem crank seals

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