Hi, my waverunner rpm took time between 5000 to

You need to have a OBD2 fault code test run. That is the 1st step.

I just had one do basically the same thing. I had to replace the impeller. It felt like a clutch was slipping. If they get any dings or nicks or anything in the impeller they will not getup speed at all.

from what i read, the RPM goes high and the speed is slow it sounds like your transmission is slipping.

Hi, most likely cause and the easiest to check is exhaust leaking in the engine compartment. Run it without the seat fitted for the same time frame and if it fixes your problem you are looking for an exhaust leak. Regards Phil.

Hi there:
DTC P0500 - Vehicle Speed Sensor Malfunction
Basically this means that the vehicle's speed as read by the Vehicle Speed Sensor (VSS) is not working properly.

Symptoms of a P0500 DTC may include:
loss of anti-lock brakes
the "anti-lock" or "brake" warning lamps on the dash may be lit
the speedometer or odometer may not work properly (or at all)
your vehicle's RPM limiter may be decreased
the shifting of an automatic transmission may become erratic
other symptoms may also be present

A code P0500 may mean that one or more of the following has happened:
The Vehicle Speed Sensor (VSS) is not reading (functioning) properly
There is a broken/frayed wire leading to the vehicle speed sensor
The vehicle's PCM is not correctly configured for the actual tire size on the vehicle

Possible Solutions:
The simplest thing to do is to reset the code and see if it comes back.
Next, check all wiring and connectors that lead to the speed sensor. The location of the sensor depends on your vehicle. The sensor could be on the rear axle, transmission, or perhaps the wheel hub (brake) assembly.
If the wiring and connectors are OK, then check the voltage at the speed sensor. Again, the exact procedure wil depend on your make and model of vehicle.
If everything looks OK, replace the sensor.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

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check the fuel positionong sencer that nmight mot b opening all the way

did you mean 900 cause 9000 is overrived and the engine may be blown

I dont know the answer but my vx deluxe is doing the same thing. Not as bad as yours but 4k rpm idle.....ANyone?

THE ENGINE VALVES ARE BENT.

first the operating range for the fuel is 35 PSI idel and 50 at full throttle and the vachum boost will allow 4 pumps very fast before it runs out of vachum thats why yo don't wantto pump breaks. and the powersteering is hydrolic and has nothing to do with vachum.