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1996 Sea doo XP motor shakes but won’t rev up

C

cops13579o

New Member
I have a 1996 sea doo xp that I bought and had it running good for a couple trips but recently it had developed a condition that makes it unusable. What happens is it will the up real good for about 3 seconds after a start up but then it suddenly stops and the motor just shakes and won’t rev up no matter what. The interesting part is if you shut the ski off and start it back up it will run good again for about 3 seconds. I’ve tried research but can’t find anything. Thanks for the help in advance. Engine is a Rotax 787.
 
I would start with a compression check. If that checks out, check the exhaust for leaks, it would have to be leaking pretty bad, but if your running it with the seat on and it’s leaking it could be starving the engine for air, if you can get it to rev up to 4500 rpm, check the volts at the battery while it’s at the 4500. Could also check that the exhaust hoses haven’t collapsed internally. If all checks out good, might be time to rebuild the carbs? When was the last time they were done? Have you owned this machine long? When was the last time it ran correctly?
 
I bought it in February this year so this is my first year of owning it. Compression is good. It doesn’t have a tachometer but it’s definitely not getting to 4,500 when it ain’t running right but when it is it gets to 7,000 ish no problem. I think it’s something with the exhaust. The water box rave valve was leaking pretty bad before but I got it fixed now and still have the problem. It ran good when I first got it but just started having problems after I cleaned the rave valves for the first time. Sounds like the exhaust get blocked when it stops running. I have videos but don’t know how to post them. Thanks for the reply!
 
I would do the compression test anyways. I’m sure it is still good and not an issue, positive actually but just nice to go through the steps to be sure. Definitely put a volt meter on the battery and see what volts your getting at idle and at 4000 rpm. Maybe a bad voltage regulator
 
Oh, and I re read your post again. This started happening after you cleaned the rave valves? If so, have a look at them again, make sure there are no holes in the bellows and that the springs are in correctly
 
I did check the RAVE Valves and they’re in good. I got the new designed one with the slots in them. But that didn’t solve my problem but every part of the RAVE valve is clean and in good shape now.
 
Well, same, check the volts, check the exhaust hose to see if it has collapsed, re check the rave bellows. If all that is good, maybe it’s fuel air related but I don’t think so, just make sure high and lows are at factory settings.
 
I’ve done some testing on it and when I hook the motor up to water via a hose no water comes out the pea hole in the back. When I have it on the water it does come out of that. Not sure if that means anything or not.
 
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