1990 Seadoo SP. Please help.

[BillM73]

My 1990 Seadoo SP (580) was running great last year until the last ride of the season. It began bogging down and dying at WOT. I figured it was likely in need of a carb rebuild and fuel filters so I just winterized it for the season.

So this year I rebuilt the carburetor and replaced the n-line fuel filter. Took it out on the river and it ran great up to 3/4 throttle where it bogged down.
Then I replaced all of the fuel lines and fuel pick-up screens... Same result
Then I replaced the fuel pump with a Mikuni (35lph). Same result.
I removed the fuel selector and verified it is clean...Same result.

These are all the solutions I've seen on the site. Does anyone have any other ideas? I'm at a loss..

 

[lloyd54123]

Is it possible since the rebuild your getting more fuel then needed and flooding yourself? What do your plugs look like?

 

[BillM73]

Is it possible since the rebuild your getting more fuel then needed and flooding yourself? What do your plugs look like?

Plugs are a brownish color...

 

[BillM73]

This is me just shooting in the dark... Could it be a defective rev limiter causing it to shut down? It will reach WOT but bogs down after a few seconds.

 

[JJinSC]

I know you said you verified the fuel selector was clean but did you pressure test it? The o-rings go bad and they start to draw air.

 

[BillM73]

I know you said you verified the fuel selector was clean but did you pressure test it? The o-rings go bad and they start to draw air.

Yep. Not leaking or drawing air. the fuel filter has no air bubbles flowing through it and it is almost completely full of fuel.

 

[JJinSC]

Full of fuel is how I found mine at the beginning of this season and it would run fine on the trailer. Pressure test showed my selector valve leaking air. Bypass and problem solved. Just saying, you cannot see well enough through the factory filter to see air leaks.

 

[BillM73]

As I stated earlier, after replacing the fuel pump, rebuilding the carburetor and changing all the fuel lines, the problem persisted. So I began to look into the ignition system. problem is, it could have been any one of a number of parts so I decided to do some "shotgun troubleshooting". I didn't want to take the thing apart more than once so I purchased the most likely culprits. A new ignition coil, ignition module and voltage regulator. I purchased all three for about $120, total.
I replaced all three parts today and put it in the water. The ski ran like a champ.

 

[JJinSC]

Glad you got it straightened out and thanks for updating us!!!