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Date Posted: 17:37:23 09/26/04 Sun
Author: Duke
Subject: Re: Sport Jet Problem
In reply to: David 's message, "Sport Jet Problem" on 07:11:34 08/03/04 Tue

I'm having the exact problem with a Sport Jet 120 in a Donzi. Can anyone expplain what is happening?


>To start with I'm a rookie, this is my first jet
>drive.
>
>It's a 1995 Sport Jet 90 & I live in Ontario Canada.
>I bought it late last summer and it ran fine. But as
>soon as I put it the water this summer something was
>wrong.
>
>At low throttle it seems to be OK, but if I try to
>accelerate quickly OR once I get past about 3/4
>throttle it "sounds" like the engine is no longer
>under load (almost like cavitation in a prop boat).
>The drive jet drive is still working, but its slower
>than a 10hp aluminum boat.
>
>I don't think I sucked up sand at the boat launch, but
>I guess it is possible. The tunnel is clear and the
>engine itself seems to be running fine.
>
>I have a repair manual, but I don't want to start
>tearing it apart until I'm reasonably sure what the
>problem is, or at least how to check it.
>
>Any suggestions will be appreciated. Thanks

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Replies:

[> [> Re: Sport Jet Problem -- Jared J Traina, 17:51:38 10/15/04 Fri

The over-revving is caused due to a worn out impeller or impeller bushing. It is kind of a big deal and commonplace in a jet motor.

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