Full throttle takeoff stops at 5000 rpm, sometimes

[scooper77515]

Ok, I thought it was a RAVE issue, so I bought all new plastic parts, new springs, etc, and even replaced one of the valves. When I floor the accelerator, I want it to shoot up to redline (6500 or 7000 rpm). But sometimes, maybe 2 out of 3 times, it will only go to around 5000 for about 10 seconds and then shoots up to 6500.

I wanted to try to ski behind it today, but if it does this, I will never get out of the water.

This is on the 97 Challenger 787 Rotax. It has done it since I got it, but seems to be doing it worse now. Used to only do it once or twice a day.

Spark plugs were new, just put in before we hit the water today.

 

[robin savell lloyd]

If water regulator is not working properly sometimes it could be flooding the pipe with water and not alowing it to hit higher rpms. Could be a soft hose that got hot and is coming apart on the inside or maybe a fuel issue. there seems to be many could be's. :cheers:

 

[scooper77515]

If it is water regulator...

Isn't that the RAVE valve looking thing at the back of the muffler?

How do I determine if it is flowing correctly or not?

I assume it is adjusted by screwing in the red screw, but I hear it is VERY sensitive to adjustments and can damage the engine if incorrect.

If it is a fuel issue or hose issue, wouldn't it be happening all the time?

 

[robin savell lloyd]

If it is water regulator...

Isn't that the RAVE valve looking thing at the back of the muffler?

How do I determine if it is flowing correctly or not?

I assume it is adjusted by screwing in the red screw, but I hear it is VERY sensitive to adjustments and can damage the engine if incorrect.

If it is a fuel issue or hose issue, wouldn't it be happening all the time?

This info I gave you came from the most knowlegeable seadoo mechanic I know. This info was was read from one of his post. I do not know much about testing. I believe that it may be missing up intermetingly which to me I would think that it would not be a adjustment but may be bad. As you know I am no pro so good luck. ps by the way I do not know for sure that this is your problem. but after cleaning rave valves I believe this is the next thing to check.

 

[scooper77515]

Gives me something to look at, as opposed to when I posted this, and I had no idea...:cheers: