98 GS Bogs on acceleration running out of ideas

[ryansmorol]

I have a clean 98 Seadoo GS with the 717 motor. I have had it for 3 years. Initially I had to replace the MPEM and the stator but it ran great after that. After the first year I decided to try to fix the fuel gauge by opening up the fuel pickup and soldering the resister to get it back online. Unfortunately the glue I used to put it back together wasn’t up to the task and failed. This began the yearlong struggle i have been going through.

1st bought aftermarket pickup without fuel sender to save little dough
2nd replaced all gray fuel lines with automotive black lines
3rd carb rebuild
4th went through all the vent holes
5th new battery
6th new spark plugs
7th new ignition coil and leads
8th carb clean and rebuild
9th new inline fuel filter
10th pressure tested fuel tank and vent valves
10th cleaned fuel selector
11th entirely new OEM mikuni carburetor
12th new wear ring and turbine oil (thought it was cavitating)

Pop Off 38 psi
145 in Both cylinders
Accelerator pump is functioning correctly

These are the current symptoms. Starts up on trailer and in water and idles perfectly. As soon as you go to take off it seems to hit a rev limit and doesn't want to fully rev up and accelerate. If you let it slowly accelerate up to speed it will evennnnnntuallllyyyy get on plane and you hit a certain speed with the throttle at full and it takes off and runs flat out. Let off the throttle and it won’t take off again until it gets enough speed. Choke makes it worse, opening gas tank doesn't help, pumping throttle doesn't help. i might have to take it to the dreaded dealership. any help would be incredible.
-Ryan

Was taking off the carb for the 10th plus time and noticed the gas was dark orange. i have seen it before when i pumped out the tank at the beginning of this ordeal. it will dump dark orange gas for 3 or 4 seconds at the beginning and then it will go back to being fine.

 

[noviceskier]

1st bought aftermarket pickup without fuel sender to save little dough
2nd replaced all gray fuel lines with automotive black lines
3rd carb rebuild
4th went through all the vent holes
5th new battery
6th new spark plugs
7th new ignition coil and leads
8th carb clean and rebuild
9th new inline fuel filter
10th pressure tested fuel tank and vent valves
10th cleaned fuel selector
11th entirely new OEM mikuni carburetor
12th new wear ring and turbine oil (thought it was cavitating)
.

inline filter? If so remove that, or do you mean the fuel strainer? Also don't clean the fuel selector valve, just replace it, 20 bucks and no chance of air leak. Akthough if it was air leak causing lean condition don't know why choke would make it worse?

Although the not wanting to "go" (do you mean it wants to bog down and die?) when giving it immediate throttle makes it seem like there's something wrong with the jet pump. There's multiple meanings in what you said but since it has a rich bog when applying choke it sounds like jet pump issue.

 

[ryansmorol]

inline filter? If so remove that, or do you mean the fuel strainer? Also don't clean the fuel selector valve, just replace it, 20 bucks and no chance of air leak.

Yes it's designed for outboard motors. the strainer leaked horribly so i removed it long ago. I'll ditch the filter.

 

[noviceskier]

Yes it's designed for outboard motors. the strainer leaked horribly so i removed it long ago. I'll ditch the filter.

yeah I recommend doing that and buying an oem one for 20 bucks. Not to mention issues others have had running them.

 

[ryansmorol]

yeah I recommend doing that and buying an oem one for 20 bucks. Not to mention issues others have had running them.

yeah I recommend doing that and buying an oem one for 20 bucks. Not to mention issues others have had running them.

Is it silly just to take it out once without the filter to see if it will run? Im seriously on the brink of burning the ski to the tires and burying the puddle. is there anyway to clean out the tank without pulling the pickup? its a bear to get that bastard out,

 

[seadooxp1996]

Fuel shut off? Sounds stupid but I once had one not work right cause of the fuel on/off/reserve. Guess it didn't create enough pressure in tank.

 

[ryansmorol]

What else can be wrong with the pump? i replaced the wear ring and the oil. the fins all look good and the impeller is perfect. one weird thing is that if i get it to bounce for a second and get the front of the drive out of the water it would rev right up and take off

 

[ryansmorol]

Fuel shut off? Sounds stupid but I once had one not work right cause of the fuel on/off/reserve. Guess it didn't create enough pressure in tank.

the shut off seems to be working and i cleaned it out. seems like good fuel flow but hard to say if its the same underway

 

[seadooxp1996]

Did u blow through the holes when the valve is in the off position? U should not get any air though any port.

 

[ryansmorol]

i did not check to see if it was shutting off. i did blow through in the regular and reserve settings and could hear the air bubbling in the gas.

 

[seadooxp1996]

I had an xp and did not use OEM carb rebuild kit (mikuni)and the thing was a dog off the line. I think I used wiseco and when I put mikuni in it the thing ran proper.

 

[seadooxp1996]

Take the fuel lines off the baffle and the filter that run off the valve and make sure no air is getting through in the off position, worth a shot. It took me an entire day to diagnose that after cleaning carbs twice. It was flooding the crap out of the motor and ran horrible

 

[ryansmorol]

I had an xp and did not use OEM carb rebuild kit (mikuni)and the thing was a dog off the line. I think I used wiseco and when I put mikuni in it the thing ran proper.

the carb set me back like 250 so it should be good to go.

 

[ryansmorol]

Take the fuel lines off the baffle and the filter that run off the valve and make sure no air is getting through in the off position, worth a shot. It took me an entire day to diagnose that after cleaning carbs twice. It was flooding the crap out of the motor and ran horrible

Could i run the line right from the top of the tank to the carb and see if it fixes it?

 

[seadooxp1996]

There are 4 lines coming out of the baffle correct? Disconnect the 2 coming from the turn off/on/reserve valve. Then disconnect the one going to the filter . Turn in the off position. You should not be able to blow air through any hose

 

[seadooxp1996]

The baffle is what goes in the fuel tank

 

[ryansmorol]

There are 4 lines coming out of the baffle correct? Disconnect the 2 coming from the turn off/on/reserve valve. Then disconnect the one going to the filter . Turn in the off position. You should not be able to blow air through any hose

ill check tomorrow and let you know.

 

[ryansmorol]

when i say the fuel pickup i mean the baffle as well. i could pinch off the reserve and run the regular line from the top of the baffle straight to the carb and see if it fixes it. then it will test if its problem with the filter and/or the selector.

 

[Ckrawiec]

It has been my humbling experience that TYPICALLY ->bogs on the throttle on the water.....Usually always traces back to the fuel/carb(s)...they are finicky. Even a brand new carb can be a finicky beeatch and would need to be tuned to your particular ski (as I would assume the High/Low speed screws might not be turned in/out to suit your ski right out of the box).

So, eliminating any fuel supply issues (that may exist -> lines, selector switch, filters, strainers, etc)....go after the carb(s) as your most likely culprit.

Where you at in NY?

 

[ryansmorol]

Lockport, NY

 

[mikidymac]

IF you are sure your tank is clean inside then yes, for a very short run, run a hose directly from the RES fitting on the tank to the carb.

#1 Are you sure the carb came with the correct jets, needle and seat, pop-off spring and screw settings?
#2 Never use an inline filter on these as they just cause problems. Spend $20 and get a new OEM strainer and be good for another 20 years.
#3 Never clean the selectors, the rubber parts inside go bad and nothing is going to save them. Spend $25 for a new OEM and be good for another 20 years.
#4 It could be your voltage regulator. If it is external then remove the red wire and see if the ski runs ok, but your battery will not be charging.

 

[ryansmorol]

Ran the tube from the reserve to the carb and it did the same thing. Pulled the red wire. Still no change

 

[ryansmorol]

Pulled the pickup and it’s clean

 

[ryansmorol]

If it’s the jet pump, what could be some issues?