How To Clean Rave Valves On Ski Doo

• #ii

Here is some data to the annual cleaning of the RAVE valve;
The RAVE, (Rotax Adaptable Variable Frazzle) valves are located higher up the exhaust valve. At that place are 2 of them per engine. They are round with a red adjustment screw in the middle. It has a prune that holds it together. How they piece of work is that they open the exhaust port larger as the engine rpm's increment. When the rpm'due south drop downwards so do the RAVE valves. They piece of work on the principle of the pressure level of the exhaust system. Rpm'southward increment, pressure level increases and the valve opens, rpm's drib pressure drops, Valve closes. They should be de-carbonized almanac. To detach the rave valves, remove the spring clip on meridian, remove the black cover. In that location is a spring under the cover. Remove the piston past turning it with a metric socket. On the bottom of the piston is the rubber "Bellows" be conscientious with the small retaining leap that hold the bellows on the piston. Remove the two 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 information technology came apart as it has to go back together that same manner again. On the base of operations, notice the notch that information technology is facing down. Make clean all the carbon off the guillotine valve. I apply carb cleaner and 400 dust newspaper. Check the bellows for any small-scale pin holes. If then replace it. If non, reassemble information technology on the clean guillotine valve, and install information technology back on the engine the same way information technology came apart. The guillotine valve only fits one way. The one closest to the exhaust piping will come off differently then the other one. You will have to remove the allen screws and turn the base and then it clears the exhaust piping. 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 ane and re-create it. Do both engines 2 per engine. Take your time and if you lot have questions give us a shout. Nosotros'll be here to aid you lot out.
If the RAVE valves are dirty information technology will non rev up correctly and could be causing your problem.

The adjustment knob (the red cap) should either exist screwed all the way in or flush to the height of the black ring of the cap. This will only affect operation, every bit far as how it jumps out of the pigsty or how well it runs for extended periods at WOT.

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Karl

• #iii

Pop the peak off first thing, and if you see oil seeping past the round leap that holds the bellows onto the piston, but nowhere else, yous may need to replace those springs to brand a tighter fit.

Simply assume you need new o-rings, since they harden up pretty speedily, and they are inexpensive.

If you lot see more oil under the cap, presume your bellows is ripped, and order one or 2 of them.

This is just looking under the plastic top with the red screw in it. Y'all can disassemble them completely in minutes and verify what you demand.

• #6

Continue us posted if yous make it a jam.

Karl

Source: https://www.seadooforum.com/threads/rave-valve-cleaning.6020/

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