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  1. #1

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    Superjet Question

    I am going to look at a 2017 Superjet that isnít currently running. As I understand it, it last ran on Memorial Day. He said it runs wide open, sputters at half throttle and had trouble restarting.

    Any suggestions on what to look at would be greatly appreciated.

    What about doing a compression check on a cold motor (seeing as it wonít run), should I put some 2-stroke oil in the cylinders, roll it over then run the test? I know the cylinders should be within about 10% of each other but, assuming and accurate gage, what pressures would you expect?

    Thanks in advance.

  2. #2
    Click avatar for tech links/info K447's Avatar
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    Do not add oil to the cylinders, there should be enough oil film from the last time it ran. Just check compression, throttle held wide open, with a healthy battery.

    After checking each cylinder twice, if one cylinder is significantly below the other you can add a dribble of oil and turn it over a few times. Then reinstall the compression gauge and note how much compression improves.

    If it runs poorly except at wide open (is that on land or on the water?) my guess would be reed valves or carburetor.

  3. #3

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    Thank you for the suggestions. I have asked but no reply yet as to if the problem was on the water or afterwards on land...Iím guessing the water. However, he did say he is tired of messing with it which makes me think he has tried to fix the problem.

    Itís pretty new so I am trying to get some idea of what I am facing and, based on that, a fair value.

  4. #4

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    After some more messaging I still donít have any clear answers. Itís probably a good deal but too many unknowns so Iím passing.

    Trying to talk myself into buying a new 2018.


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