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  1. #1

    Join Date
    Apr 2013
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    Chicago il
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    16

    2000 Yamaha gp1200r engine questions

    Hey,
    The story starts when i bought the ski in march last year from some guy in Michigan, (was fun drifting with trailer on snow) When i inspect it before i went for the first run it seemed fine, after first run i changed the sparks, instaled the d plate as the resonator was totaly sh... besides that i didnt do anything , the problems started when i was on my vacation for 5 days and on day 4 the ski started to go slow and it seemd like missed fire. On the second day of vacation i forgot to close the drain plugs (noob stuuf) but i took it of water right away and it worked fine after that. On the 4 day it seemed like its not taking enough oil compering to my friends, and brothers ski did. I didnt ride the ski since than.. but the problem now is that: 1) Spark plug on cylinder 3 was bend. 2) ski is week. 3) pressure on cylinder 3 is 0... 123 120 0. As some of u guys told me I did the engine pressure test and do not see any leaks, unless its somewhere in the botom where i cant exactly see. After pressure testing the engine i took it a part and there we goo the 3rd cylinder it totaly fuc... up. the question is why? I am planing on getting the engine out ,putting it apart, cleaning it ,and puting it back. Prob going to replace all cylinders, pistons and rings. The question is whats the problem with the third cylinder? Oil Lines were ateched. Another question.;. is it normal to have a sand on the headgasket? I know its cooled by water but isnt there any filter before the water goes to the ENGINE?? I Can replece the cylinder and piston but i know its not the solution? Any other tests i could do? Help Out guys i am a noobie with these engines.

    Thanks a lot ofr any help.


  2. #2

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  3. #3

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  4. #4

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  5. #5

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  6. #6

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  7. #7

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    It has 148 hrs..... on original engine i think, last owner didnt do shittt besides riding it.

  8. #8

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    This conector was unpluged for some reason , from i can see its the exhaust temp or oxy sensor. What to do with it?

  9. #9

    Join Date
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    Greenville, NC
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    If I had to guess with those pictures I would say that a bearing on the crank let go. That is exactly what mine looked like when it went but mine seized the whole engine.

    That plug has to be unplugged and a chip put in its place when you install the d-plate

  10. #10

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    Yea thats what I am thinking but will get to it during weekend ( out of state during week) yea I remember now about that conector.
    So with this damage to cyl 3 i will have to take the engine apart and clean it, correct ?

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