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97 GTX Surging (yea I know but read anyway)

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Gonzo

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I have a 97 GTX that is surging @ high RPMs. I am going to the lake on vacation next week and want to try and get it resolved. I have done a lot of searching and found great info here. I know I need to check the internal filters on the carbs and pull/clean the RAVS. are there any tech articles on how to pull these? I see the ones that show what they look like and where to clean, I printed those and they are AWESOME, but not where they are on teh boat and how to pull them.

Also, what else could it be if those steps dont fix it, the boat is low hrs my mom (I am 35) rarely rode and we are not up there but about once every 3 weekends.

THanks in advance!!
 
Here is some information on the RAVE valve;

RAVE VALVE annual cleaning

________________________________________The RAVE, (Rotax Adjustable Variable Exhaust) valves are located above the exhaust valve. There are 2 of them per engine. They are round with a red adjustment screw in the middle. It has a clip that holds it together. How they work is that they open the exhaust port larger as the engine rpm's increase. When the rpm's drop down so do the RAVE valves. They work on the principle of the pressure of the exhaust system. Rpm's increase, pressure increases and the valve opens, rpm's drop pressure drops, Valve closes. They should be de-carbonized annual. To disassemble the rave valves, remove the spring clip on top, remove the black cover. There is a spring under the cover. Remove the piston by turning it with a metric socket. On the bottom of the piston is the rubber "Bellows" be careful with the small retaining spring that hold the bellows on the piston. Remove the 2 allen screws that hold the base on the cylinder. Remove the base and gasket. The long valve won't fall in the cylinder just pull it out. There is an o ring under the base, on the shaft of the guillotine valve. Be careful to see how it came apart as it has to go back together that same way again. On the base, notice the notch that it is facing down. Clean all the carbon off the guillotine valve. I use carb cleaner and 400 grit paper. Check the bellows for any small pin holes. If so replace it. If not, reassemble it on the clean guillotine valve, and install it back on the engine the same way it came apart. The guillotine valve only fits one way. The one closest to the exhaust pipe will come off differently then the other one. You will have to remove the allen screws and turn the base so it clears the exhaust pipe. I would do one at a time in case you forget how it goes back together again. This way you can look at the other one and copy it. Do both engines 2 per engine. Take your time and if you have questions give us a shout. We'll be here to help you out.
If the RAVE valves are dirty it will not rev up correctly and could be causing your problem.

The adjustment knob (the red cap) should either be screwed all the way in or flush to the top of the black ring of the cap. This will only affect performance, as far as how it jumps out of the hole or how well it runs for extended periods at WOT.

I hope this information helps you.

Karl
 
Thats AWESOME, thanks. Do I have two engines on a 97GTX? I was reading the history post (another great one) and didnt see that in there, but it was late last night when I did.
 
uh... a 97 GTX is a PWC...only some Jet Boats have 2 engines.

Karl

lol, sorry, I call everything that floats and has an engine a boat... habit. I didnt think it had 2 but as fast as these things are getting I wasnt sure, thanks again !!
 
I got them out and boy are they gummed up!! I know how to clean them from the posts thanks, but what about inside the block? should I squirt some carb cleaner in there and work it around with a flathead and a rag?

thanks
 
As long as you don't drop anything in there, you could do that. But now you know you should clean the RAVEs periodically and it woun't be as bad each time as it was this time! :)
 
Yes sir and will do! Im 35 and its moms and dads, after dad passed last year I took on all the maint of the boats... *including PWCS:)* /cars/mowers etc... up here.

thanks again!
 
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