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  1. #1
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    Yamaha gpr 1200 Comression checks uneven

    Is it normal for three cylinders to check 90,100,and 110? They all come right up and hold steady, but its weird that they would each move up 10 psi from bow to stern above the previous cylinder. Any sugesstions appreciated. Thanks,


  2. #2
    L Carlson's Avatar
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    Buy 3 new ring sets and change them. How many hrs on the motor?

  3. #3
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    Quote Originally Posted by L Carlson View Post
    Buy 3 new ring sets and change them. How many hrs on the motor?
    129 hrs. Hi lee thanks for chimming in. This is the same ski you helped me get running whith the new cdi. My neighbor finnaly produced a title and now I'm not sure if I still want it. The things pulls to the left and the prop also hits the inside of the house. You can hear it rattleing when you crank it on the trailer

  4. #4

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    (prop also hits the inside of the house. You can hear it rattleing when you crank it on the trailer) my mates ski does that aswell does that mean there is somthing wrong or do they all do that

  5. #5
    Moderator beerdart's Avatar
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    Sounds like your wear ring is exfoliating and blistering causing waves thay hit the impeller.

  6. #6
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by Danman View Post
    Is it normal for three cylinders to check 90,100,and 110? They all come right up and hold steady, but its weird that they would each move up 10 psi from bow to stern above the previous cylinder. Any sugesstions appreciated. Thanks,
    sometimes when cranking, the oil injection will put oil in the cylinder causing the psi to increase

    check in reverse order and see

    when I check compression, I do #1, #2, #3, then #1 again to see if the oil is adding psi

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