Sport Jet Problem -- Hi Performance Boats Inc.

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Date Posted: 07:11:34 08/03/04 Tue
Author: David
Subject:

Sport Jet Problem

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 -- Target, 20:10:28 08/11/04 Wed

You may want to check the gasket around the ride plate.
The gasket fits between the hull and the ride plate and should be flush to the hull. Also check the ensure that the plate is not bent.
This is typically caused by starting the motor out of the water and having it backfire.
If it is popped out of place, I've used a rubber mallet to re-install it (assuming it is in good condition).

>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

[ Post a Reply to This Message ]
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[> Re: Sport Jet Problem -- florent, 21:40:03 08/16/04 Mon

please let me know if is sea rayder 90hp mercury ,i want to buy one here in thailand,is good engine running fast please let me know
please email me manager@thaifrance.com

>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

[ Post a Reply to This Message ]
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[> Re: Sport Jet Problem -- Duke, 17:37:23 09/26/04 Sun

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

[ Post a Reply to This Message ]
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[> [> 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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