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rave valves.?
- Thread starter srilla
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They should be cleaned annually.
Karl
Karl
Here is some info on the RAVE valves;
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 holds 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, if so equiped. 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 helps you understand the rave valves a bit better.
Karl
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 holds 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, if so equiped. 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 helps you understand the rave valves a bit better.
Karl
Glad to help out. Let us know if you need more advise.
Karl
Karl
srilla
New Member
ok so i took the rave valve apart today, the screws were super tight. there was no gasket on it and when i picked up the rave valve and let go...it dropped, the other one i did not completly take apart, but when i picked up the rave on that one, i had to inforce some pressure and when i let go it would stay. i had to push it down. which one is the bad one? im assuming i have to scrape off all of the gunk on it?
and why is it that when i let go it just drops?
thanks
and why is it that when i let go it just drops?
thanks
dsw222
Active Member
I think i understand what you are saying in your post, but the terms you are using are pretty vague.
The rave valves are in the "dropped" position when you start your boat. When you get up to around 5000 RPM, the exhaust pressure that is being generated reaches the point where it will force open the valve to the "picked up" position, therefore letting the exhaust out of a bigger opening, which in turn generates more power.
If you lift up the valve and it stays it the open position when you let go, that probably means that the gunk built up on it is making it stick open and not go back to its natural position.
Take them all out and clean them. I use a wire wheel attached to a power drill in combination with carb cleaner to get them shiny.
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