1999 GSX Rfi with a bizarre no run issue

[Nlped]

Okay, I have a 1999 Sea Doo GSX Rfi that has been freshly rebuilt (about 10 hrs.). I was out riding it the other day and it all of a sudden started missing and lost all power. I got it to crank, but it wouldn't turn over 3500 rpm, so it was a long ride home.

I got it out of the water and did a quick once over and saw nothing obvious. I put new plugs in it, checked the compression (155 & 160 #), checked for an exhaust leak (hoping it was just suffocating itself) but found nothing. I tryed checking out a few other possibilities, but to no avail. I keep coming back to an exhaust issue. I can get it to clean up and run with the seat off, but with the seat on, or after some sharp turns it dies and then is a pain to get restarted and keep running. I pulled the rubber hose from the "discharge" tube on the starboard side and off the big black round "doo-hickie" that looks like a muffler. After removing the hose and cranking it back up, the "doo-hickie" was full of water...is this normal? Is this my problem, and if so, what is letting water get into it, and why doesn't it have some sort of drain?

Thanks,

E

 

[Nlped]

Found something small

I was fooling around trying to find a hose with a hole, or a loose fitting, and found that the bizarre looking valve on the top of the (I now know) water box that looks alot like the 2 valves on the motor near the intake side and it was very loose. I took it off, and apart, and fiddled with it and finally put a small amount of thread tape on the fitting and tightened it to just hand tight and reattached everything. I am going to put this thing back in the water this evening and try my luck...AGAIN.


Am I going in the wrong direction? HELP

 

[kustomkarl]

That's the doo-hicky you ment??? The "Thing" on the resoniator is called a Water Flow Regulator valve. Here is some information on it;
The water flow regulator has been calibrated at the factory and should not be tampered with or modified in any way.
CAUTION: Strictly adhere to the calibration procedure or otherwise serious engine damage will occur.
If engine does not maintain RPM or the engine is experiencing poor performance, the water flow regulator valve might be out of adjustment. The normal adjustment as done at the factory is as follows: On the top of the water flow regulator valve locate the red plastic adjustment screw. Mark the location of the screw with a dab of paint for reference. Turn the screw clockwise (tighten) until the top edge of the screw is flush with the top of the black cap. Turn the screw 2 clicks counterclockwise (loosen). This is the factory spring setting. The bottom tapered screw should be screwed in just snug.

This Regulator valve plays an important part in cooling the engine. Each fitting is a special size and controls the flow of water to the different part of the engine depending on the rpm. Never mix up the fittings or you'll have problems with over heating and maybe seizure.


Karl

 

[Nlped]

I didn't mess with the adjustment at all. I just realized it wasn't even remotely tight. It moved freely by mearly touching one of the two lines that are connected to it. I just took the whole piece off and added a very small amount of thread tape (there wasn't any prior) and put the item back on only hand tight. I assume this item needs to be tight to enable a vacuum tight fitting, otherwise wouldn't the vacuum that is being received from the intake tube would escape here, rather than "pulling" the water out of the water box?

Fear not, I am truely thankful for the input, and I will be doing the "setting" of the valve, per your instructions.

E

 

[kustomkarl]

The valve is pre set...just check it to be sure its still correct. The valve should be tight to correctly achieve proper flow.

Karl

 

[Nlped]

Now it gets better!

I did all this stuff and put it back in the water. Running great...great, and a sharp turn, and poof...dies. Then I sit for a minute or two and it runs fine for a few second...then...dead. Back and forth with this, and I finally got it back to the launch and pulled it out of the water. Replaced the plugs, turned the motor over with the plugs out...no water, still has the same compression....blah blah blah.

Put it all back together, and now it has a flashing maintenance light and the LCD flashing "Maint" , and it won't turn over 3500 rpm again. What the (insert profanity here) is going on?

HELP

 

[kustomkarl]

The seadoo might have a trouble code the only the seadoo dealer can diagnose. Bring it in so it can be serviced and reset.

Karl

 

[Nlped]

Beautiful...