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  1. #1

    New to stand ups need some help please.

    I have a 85 js 440 .I can't figure out why it won't go fast enough to plane out.I think it has to do with cavitation because the the when riding it will start right up and go good till about half throttle then the ski will hold its speed (10mph) and when I give it more throttle the engine picks up speed but the ski wont.I thought it was the stock chewed impeller, so I switched a good one on it .took it back out and it's the same or a little worse! The gaps between the impeller and pump look great.I'm really flustered please help me!

  2. #2
    Pain is fear leaving your body.... rlovebk's Avatar
    Join Date
    Aug 2008
    So. Cal.
    You sure you are getting the correct rpm's? It sounds like if cavitation is not an issue that you have a fuel issue. Clean carb/screen?

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