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  1. #1

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    piston wash, motor prob ?

    My ski started getting a weird vibration at full throttle. Checked compression 150 on all three. Took it back out and at wide open it shut down and water temp buzzer went off. Started right back up and I rode it back to the beach with no problems. Checked comp again still all good. Pulled head just to look at everything it all looks good cylinders and pistons. Here are pics of my pistons. how does my wash look. And do any of you know what to look for next.
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  2. #2
    TuningForkMarine's Avatar
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    150 ? thats alot no ? 150 is entry level engine mods for 1300R yours is a 1200r judging by the color.

  3. #3

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    This is a 1390 with trued welded crank with about 30 hrs on it.

  4. #4

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    Before I start pulling the cylinders off is there any way to check or test crank

  5. #5
    A little hard to tell form the photos but 1-2 look lean and 3 good to rich. If its a carb 1390 motor. I believe reading wash on the 1300 EFi units are different I think? I had a motor do this to me one time. It was a gp1200. But had one cyl that was a bit different wash. Turned out to be a small hairline crack in the head and water injestion. Compression tested out ok too

    You should be able to test the crank by bring the first(or any) cyl to TDC and measure the other two, should be the same measurement.

  6. #6

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    I will do that. It is a carb ski 2001 Thanks for replying back

  7. #7
    1200Jet's Avatar
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    I think your number 1 (mag end) looks good, on the lean side but still good.
    Your number 2 looks like its about to seize (way to lean).
    And your number 3 PTO is either way to rich or is been washed by water ingress, have a look down the side of the cylinder wall for signs of water intrusion. It's likely given the water temp alarm that this is your problem.

    Does it idle high on the trailer? If so do a pressure test/leak check of the engine.

    150psi is on the high side but perfectly fine if your engine is in good shape and your running premium fuel. However the second you start to encounter air leaks, carb issues or ignition problems your engine will be over the detonation limit already. Are there signs of pitting (mild detonation damage) on the top of the piston and in the head domes?

  8. #8

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    Thank you. It does idle really high on the trailer. I keep having to tune the idle down when on the trailer. If that is it were would the leak most likely be head or cylinder, Carbs. I think you probably found the problem. Thanks for you input.

  9. #9

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    Yes slight pitting. 1 and 3 cylinders look great. number 2 has some small scarring. here are some more pics
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  10. #10

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    Here is number 3 piston and number 2 cylinder
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