Aprilia RS 125 powervalve rave system
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Aprilia RS 125 Rotax Powervalve Rave valve assembly operation video
Aprilia RS 125 rotax 122 power rave exhaust valve PV valve cable and spring + fitting kit
Aprilia RS 125 power valve pv solenoid testing ( RAVE )
Rave - diagnostics flow chart
Rave II was the first generation of rotax power valve. Rave by the way stands for Rotax Automatically Variable Exhaust. The Rave II works pneumatically (by air). A drilling transfers some air from the exhaust port to a diaphragm which forms part of the pv assy. The valve blade is bolted to this rubber diaphragm, so when the exhaust gas pressure reaches a high enough level to overcome a tensioner spring acting on the back of the diaphragm, the diaphragm can inflate and in doing so it opens up the powervalve. The tensioner spring has an adjustable preload so that the rpm floor at which the spring tension is overcome can be adjusted, and hence the pv opening rpm.
The new powervalve is electronically operated by a solenoid aka. servo,motor, etc. The description Motor is incorrect, the device is a solenoid or servo this in esence a fairly powerful electro-magnet. When the servo coil is fed power it becomes a magnet which pull the iron centre in(which in turn pulls upon the cable). The new powervalve is called RAVE-E.
Rave-E and Rave II are equally likely to sieze in place. The ONLY sure way to make sure it doesn't sieze is make sure you ride with it open (a task most enjoyable). The main advantage of Rave II is that you don't need any electrical bits for it to work. Where as the RAVE-E needs an rpm sensor and control box to energize the electro-magnet coil. However the electronic type also has an advantage from a blade siezure point of view. It has a cycle at below 2500rpm where the valve is opened to assist keeping it clean.
On my rs I have the RAVE-E. It is possible to fit a RAVE II but you do have to remove a small plug from the air pressure transfer drilling.
CHECKING PV FUNCTIONING (CHEATS WAY)
One way to check the solenoid function is to put 12v accross the multiplug it connects with.
pv solenoid testing ( RAVE )
Find the solenoid and trace the two pieces of wire coming off it (electrical wire) not the pv cable. It will end in a two way multiplug which you need to pull apart, it will show two male spade clip terminals. To test it all you need to do is get two female spade clips on two pieces of wire (1.5mm square will do it), and attatch two crocodile clips to the other ends of the wire. One spade clip onto each of the spade terminals in the multiplug, one of those crocky clips on good live. The other crocky clip you can hold against the frame (making sure you have a good Earth) when you make contact with the frame it will open supply current to the solenoid. you will see it moving if all is ok. Don't worry there is no way you will get a jolt off this procedure. Its safe. Also it doesnt matter which way round the clips are connected. ie. either can be live or neutral.
Aprilia RS 125 RAVE exhaust valve new RX ETX Rotax 122 - 3 years warranty !
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