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  1. #1
    My Jet Ski drinks more than yours Glenozzy's Avatar
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    ultra 300 dropped to 10mph from 74mph super charger looks ok

    ok today my ultra 310 dropped from 74 to 10 ran slowly back to dock i was sure i lost my super charger belt but was still attached and spinning.
    took it back out running good until i get near top speed then starts to vibrate and stop running good will idle fine then will run ok again

    so super charger belt? supper charger? or pump?

    best place to start

    G


  2. #2
    My Jet Ski drinks more than yours Glenozzy's Avatar
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    Belt and pulleys are good
    vibration is at low speed going to pull the pump

  3. #3
    My Jet Ski drinks more than yours Glenozzy's Avatar
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    OK now i need help

    pulled pump and it is in perfect condition not even a nick on the blades

    spin easily

    have vibration when idling RPM jump every 30 seconds and drop back down

    can i start it with the pump off?

  4. #4
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    No, do not start without the pump. It will windmill the driveshaft around in the pump tunnel.

    Have you checked for symptoms of crank thrust?

    Sean

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