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Cleaned Rave valves now stuck below 4,000 RPM

*_*

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Water Crafts
1996 Sea-Doo Challenger
#1
Hello experts! First time post and you all have given me a lot of useful info so far and hope you can help me again.

I have a 1996 Challenger with the single 787 engine. I cleaned the rave valves yesterday and took it out on the water today for a test run.

It appeared that the valves have not been out since the boat was new. Initially, the boat accelerated much better than before, and was getting much faster than before. After bringing the throttle back to idle, I tried to accelerate again, and it will only get to 4,000RPM and about 10 mph.

I pulled the boat out of the water and tested it on the trailer where it got up to a quick max RPM. I put her back in the water and the same thing. Idle out, accelerate very well, idle, and stuck below 4k.

Possible cause, but not sure. My rebuild kits are a few days out, so I just cleaned and put everything back together.



BTW, I used the search function and was unable to find this issue. This is my first PWC so highly possible ignorance on my side.

Back story on the boat. I just got it from a relative where is sat for 2 years. First run basically stuck at idle. After replacing all the fuel lines, cleaning all the fuel filters and carbs, draining and replacing gas, replacing plugs, and running sea foam it ran well. Would only top out about 28mph, but started, idled, and ran well.

Thanks for any ideas, and again, thanks for all then info I have used on this forum to get the boat back on the water.

*_*
 


etemplet

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Louisiana
Water Crafts
1996 SPI, 1996 GTX, 1997 GTX
#2
It's pretty easy to get a gasket rub on the rave valve. That will stop them from moving freely, not opening fully or not closing. Also it is not uncommon for an engine that hasn't been run in a while to develop issues after the first couple of hours of operation. Usually the carbs. All the funk in the lines gets loose and plugs things up.
 

*_*

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Water Crafts
1996 Sea-Doo Challenger
#3
Thanks for the reply. So gasket rub? Anyway to know or clean it?
 

JeremyD615

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Location
Nashville, TN
Water Crafts
1995 Sea Doo Speedster
1995 Sea Doo XP
1996 Sea Doo XP
#5
You really need to go through and rebuild those carbs. Rebuild the raves when the parts come in and see what it does, but I think you’re going to have to dig further into the carbs to get it running right... Use only genuine Mikuni carb kits and follow the carb rebuild sticky to the letter...
 

*_*

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Water Crafts
1996 Sea-Doo Challenger
#6
Just found my issue. When I put the rave valves back together, I didn't seat the bellows in the assembly. Just took the boat out for an hour and ran great.

Glad it was an easy and free fix.

It could still use a carb rebuild, but for now, all is great.
 

JeremyD615

Well-Known Member
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Location
Nashville, TN
Water Crafts
1995 Sea Doo Speedster
1995 Sea Doo XP
1996 Sea Doo XP
#7
Well I’m going to put this out there. If you “think” you still need a carb rebuild, you do. That’s the number one cause for fried pistons in these things. People know there is a carb issue and ride it anyway right until the motor seizes...
 

*_*

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Water Crafts
1996 Sea-Doo Challenger
#8
Well I’m going to put this out there. If you “think” you still need a carb rebuild, you do. That’s the number one cause for fried pistons in these things. People know there is a carb issue and ride it anyway right until the motor seizes...

I guess I would be in the “ride it till it dies” group with out this chat. It idles great, and top end is running smooth, just a little choppy in the midrange.

Thanks for the heads up.
 

Ckrawiec

Active Member
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Location
Rochester, NY
Water Crafts
1996 GTX
2017 Spark 2UP
2018 GTS
2006 Bayliner 185BR
#9
I guess I would be in the “ride it till it dies” group with out this chat. It idles great, and top end is running smooth, just a little choppy in the midrange.

Thanks for the heads up.
To each, his own...but I echo what JeremyD615 has suggested.....get into those carbs as soon as possible, follow the sticky post....the boat will reward you with even better performance (in all likelihood :thumbs-up::innocent:)
 

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