96 xp Rave Valves

[thetsunamimike]

ok i understand what a rave valve does but if they didnt want you to adjust them then why do they give you the ability to?????? is it possible to adjust them and get more Power or anything of that nature? has anyone messed with this? what were the outcomes if so?

 

[glenwhitt]

adjusting

ok i understand what a rave valve does but if they didnt want you to adjust them then why do they give you the ability to?????? is it possible to adjust them and get more Power or anything of that nature? has anyone messed with this? what were the outcomes if so?

Down is better low end and up is better top end. Mine are flush. I have no better top end with them up anymore than flush. Not sure about the bottom end, not concerend out about that to much, hence my tag line

 

[crxski]

Changing the position of the red caps height changes the exhaust valves timing for when it opens up. It will change your power curve alittle but can't see it doing much more then that. Might help fuel mileage for curzing if they open late. My ski-doo is flush like 99% of the ones I've seen but I noticed my GSX is lower, and I heard it should be flush as well. So I might adjust mine and see what it does.

 

[kustomkarl]

Here is some information on the RAVE,(Rotax Adjustable Variable Exhaust) Valve;

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.

Karl

 

[thetsunamimike]

my xp is bogging down at high WOT could this be the cause of it?

 

[crxski]

my xp is bogging down at high WOT could this be the cause of it?

Whats the plugs look like? Might want to check your jets first could be leaning out, or make sure our fuel lines are replaced and the carb filters are clean.

 

[kustomkarl]

my xp is bogging down at high WOT could this be the cause of it?

Here is some info on the RAVE valve;
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.

Karl

 

[97gsxRIDER]

it does make a difference.....what about the exhaust one? What difference does this make? All the way down makes it open up sooner, and flush seems to make it open later, but i suppose you willl get more power top end if they are flush......

The exhaust rave valve, what does that control? water flow? how does it work? lower would give less water? wich would make more top end right?

 

[B18c1TurboedEK]

Just curious, what would happen if one the Rave valves bolts come out while riding it? One of the allen bolts?

It happened to me on Sat, i noticed the ski making a loud ticking noise. So i popped the hood and saw one bolt missing and oil on top of motor. I idle back into shore, is their anything i should be concerened about now?

 

[97gsxRIDER]

Make sure the oil was coming from the rave Wich I'm sure it wass. Might as well take them out clean them make sure they are in good shape and check the gaskets.

 

[97gsxRIDER]

I like my rave valves flush on the engine, and the exhaust one down, seems to be a nice mix