What does a Sea Doo rave valve do?
Sea-Doo’s RAVE (or R.A.V.E. = Rotax Adjustable Variable Exhaust) valves were the special exhaust power valves on their 2-stroke Rotax engines. They were designed to change the size of the exhaust ports in order to widen the engine’s power band. Using RAVE valves ensured better low-end power and a higher top speed.
How do you test a rave valve?
To test the raves, just remove the caps and watch them when you start the sled. The valves should be closed at idle and open when crankcase pressure increases under throttle.
How often should you clean rave valves?
valves is not a big deal and should be done at least every 1000 miles (I prefer every 500 miles). Once you get the hang of it, you’ll find that this takes very little time. By doing it often you will also find that it will not only keep your sled running at its peek, but also aids in the cleaning the next time.
What do power valves do on a snowmobile?
Two-stroke exhaust power valves enable snowmobiles to deliver excellent throttle response at low rpm and maximum top-end power. That’s why you’ll find them on just about every two-stroke sled made since the 1980s. Like any engine, a two-stroke snowmobile engine requires air to operate.
What RPM do rave valves open?
Gradual application of the throttle, however, will result in the RAVE valve opening much later, i.e. 7300-7500 RPM. If the RAVE valve opens too late, the engine will bog or hesitate momentarily as the RPM increases.
What are the symptoms of a bad seadoo 951 RAVE valve?
Symptoms of a bad SeaDoo 951 RAVE valve are given below: The height of the exhaust valve relative to the piston travel determines the power curve of the engine. If the RAVE valve is damaged, the exhaust valve gets ‘lower’.
Do rave valves cause issues at low end?
I was told improperly adjusted rave valves will cause issues either at low end or wide open. My ski seems to run good but it seems to be missing a few RPM at the top.
Are rave valves bad for the GTX 787?
I have a 1997 GTX with the 787. I was told improperly adjusted rave valves will cause issues either at low end or wide open. My ski seems to run good but it seems to be missing a few RPM at the top. It will only hit about 6400 RPM.
How do I know if my RAVE valve is stuck?
All kinds of dirt and oil mix and get the RAVE valve stuck. Another sign of this is that you may hear unusual gurgling sounds coming from the valves. If the RAVE valve is stuck shut, the watercraft would still get up to top RPM.
https://www.youtube.com/watch?v=XOXVl2g6Jgw