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Thread: Outboard jet question

  1. #1
    New member
    Join Date
    Dec 2016
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    6

    Default Outboard jet question

    Will cavitation/ over-revving affect my outboard? I have to cross small waves occasionally with seaArk tunnel and jet loses grip on the water sometimes. Thanks..

  2. #2
    Member
    Join Date
    Apr 2006
    Location
    All-I-SAW, AK.
    Posts
    1,090

    Default

    Yes. It's certainly not a good practice. Damage could happen quick, could happen later. But it's definitely not good for it.
    The motor and jet unit are designed too be ran with torque from water pressure.
    Kinda like dry firing a bow without an arrow. You'll only get away with it for so long until something breaks.
    Also, you can "burn" the impellor and damage it as well from it free spinning at higher rpm's without water pressure against it as well.

  3. #3
    New member
    Join Date
    Aug 2016
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    4

    Default

    I trim the motor down to avoid cavitation my jet. I have also shimmed my motor for more down trim. This helps me jump on step, then just trim up to 3. Iím running a Yamaha 60/40 with a custom tunnel on a 14í Hewescraft. No problems so far.

    Mike

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