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  1. #1

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    Question 17í GP1800 top speed 63mph?

    Whatís the usual top speed for a stock 17í gp1800, 69mph? I was using my iPhone 12 Pro Max with a speedometer app and could only hit 62.9mph on a decently calm ocean this morning, definitely not flat either. I only weigh 145lbs and the ski has 45 hours so I had high hopes for getting into the low 70ís, does 63mph sound about right?

  2. #2
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by wfirst View Post
    Ö does 63mph sound about right?
    Nope.

    What RPM is the dash showing, sustained, at wide open throttle?

    What octane gasoline are you using?

    Fresh spark plugs?

  3. #3

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    Quote Originally Posted by K447 View Post
    Nope.

    What RPM is the dash showing, sustained, at wide open throttle?

    What octane gasoline are you using?

    Fresh spark plugs?
    Didnít think to look at the RPMís. 91 octane. Brand new spark plugs, oil, stator, and rectifier. My speedometer only reads 0 but the paddle wheel spins freely, hence the use of the iPhone speedo app.

  4. #4
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by wfirst View Post
    Didnít think to look at the RPMís.
    91 octane.

    Brand new spark plugs, oil, stator, and rectifier.

    My speedometer only reads 0 Ö
    Was some repair work done to this machine recently?

    Has it ever run properly with full power and speed for you?

    I am wondering about whatever mechanical repair work was done, some things were perhaps left unplugged or not re-connected properly.

    Are the correct spark plugs installed?

  5. #5
    Click avatar for tech links/info K447's Avatar
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    BTW are you aware that all 2017 and 2018 GP1800 should have the hull reinforced where the intake grate rear bolts are located?

  6. #6

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    Yes, I literally just picked it up yesterday from the jetski mechanic. I am the third owner of this ski, so I’m not quite sure I’ve ever got to experience it’s full potential, I was only able to ride it a couple times before, I recall it having a little more kick to it honestly but who knows, it’s been nearly two months since I last ride it. I’ll check the spark plugs and see if anything’s loose. I am aware of the hull intake grate issue.

  7. #7
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    Have you checked your clutch, it could be slipping or you could have a boost leak

  8. #8

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    Quote Originally Posted by BLASTER 1 View Post
    Have you checked your clutch, it could be slipping or you could have a boost leak
    well I think I’ve figured it out. J pipe was completely disconnected on the inter cooler side.
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  9. #9
    Glad you found it. It should rip after you reconnect it.

  10. #10
    BLASTER 1's Avatar
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    Quote Originally Posted by wfirst View Post
    well I think I’ve figured it out. J pipe was completely disconnected on the inter cooler side.
    Yup, that will do it everytime, what kind of a clamp you have there, looks different to me


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