2001 Seadoo GTX DI won't stay running on water

[MichaelRoll]

Hello everyone. My ski runs fine out of water and with water line hooked up, but when I put it in water it runs for a few seconds then dies and will not restart. It just keeps cranking over and over. When I take it out of the water and let it sit for a while I will start and run on trailer. I took it to a couple of shops and they told me it needs a new motor. I can believe that is the case.

I like to work on everything, but have not work on a PWC before. Any help would be appreciated. Thank you for your time.

 

[Coastiejoe]

The DI ski requires some very specific things. One of which is Fuel Pump Pressure.

You need to do two tests and then we can go from there.
A cylinder compression test and a Fuel Pump Pressure test. At idle, 107 PSI is the normal.

 

[Sportster-2001-951C-Stock]

Normally this engine will produce 130~145psi static compression in excellent running condition. If too low the engine needs to be rebuilt.

 

[Dr Honda]

Normally this engine will produce 130~145psi static compression in excellent running condition. If too low the engine needs to be rebuilt.

DING DING DING.... we have a winner. (lol)


OK... but seriously... I'm guessing the compression is low, and once it has a load on the pump, and water in the muffler... it doesn't have enough compression to run. I've seen this a lot of times.

The good news is... if this is the case... a fresh set of rings can bring it back. (and it's cheap)

So... check that, and we can go from there.

 

[Sportster-2001-951C-Stock]

The good news is... if this is the case... a fresh set of rings can bring it back. (and it's cheap)

Yes, the story of battered rings (and worn pistons) is a common one and fully expected eventually, assuming that's what you discover while performing pre/post-season compression tests:

http://edj.net/2stroke/jennings/topend_rebuild.pdf

 

[SeadooMaster]

I have the same Ski but different issues. Rebuild the engine totally in my opinion, the DI's suck they take so much care and maintenance I just payed over 250 dollars in the Rave engine valves and the Water box valve as well...