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  1. #1
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    Default 717 compression test

    Just purchased a 717 remanufactured motor(not sbt). I installed the new motor and ran it for 5 mins with a pre-mix. After that, I did a quick compression test to see how the motor would fair. I was only getting about 138 on both cylinders.

    I was hoping for numbers in the 150+ range considering the motor is new. A mechanic told me that the engine will need to be broken in more and I should gain compression when everything has a chance to work itself in.

    Does this sound right or did I just get a weaker motor?

    Thoughts and thanks!

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  3. #2
    SeadooForum Pro El Toro 33809's Avatar
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    If you have only run it for 5 minutes, the rings have probably not "seated". It sounds like what your mechanic told you is accurate. Test the compression again after the proper break in sequence.

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  4. #3
    Dr Honda's Avatar
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    If everything is absolutely perfect... it will show about 145 on a fresh engine. But... it's not uncommon for a brand new engine to need a little time before giving you a good compression number. Burn a couple tanks of fuel, and re-check.
    Tony
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    I'm not going to be able to do vinyl or carbs for a while. Starting my new job is taking a lot of time

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  5. #4
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    Sounds good! I will give it a proper break in and let everyone know what the new numbers are. Thanks for the feedback and the advice. It's really appreciated.

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  6. #5
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    I had mine rebuilt and tested it after a few hours and had about 138 psi on both cylinders. Will test again once it is broken in. It seems to run really well with good power.

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