I have a 1999 GS. Didnt run very well so I rebuilt the carb. Now it starts and idles great but it bogs when throttle is pushed and takes some throttle play to get on plane, but runs slow. However, if i hit a wake and the impeller free spins, it takes off like a rocket!! Once i let off the throttle, it goes back to where it started. Any thoughts?
1999 GS runs slow until impeller is out of water
- Thread starter doboshine
- Start date
TheGTIjetguy
Member
The third cable goes to your oil pump to increase flow with throttle. Sounds like you still have fuel delivery issues. Did you rebuild with genuine mikuni brand carb kits?
Also, do a compression check and report the numbers.
Also, do a compression check and report the numbers.
I have 2 2005 sea doo GTI’s (717), and they were doing the exact same thing. I purchased them from a guy that couldn’t figure out the issue either. They would run about 25 mph and barely get on plane. If you were to add a second person they would sink. I originally checked the compression and they were at 137 psi or so on each cylinder. I changed out the carbs thinking that could be the problem. Once I changed out the carbs they would no longer take off once you hit the top of the wave a few times. We went back to the carbs and found out that the Mikuni carb that was ordered on Amazon had the wrong size Jets. So we are re-jetting the carbs at the moment. We also checked the rotary valves and housing for wear on 1 of them and that was fine as well. Just to explain it a little better, out of water the skis will hit the rev-limiter, in the water they have very little power.
It’s most likely the pop-off pressure in the carb
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