Just thought id take some photos of me removing the powervalve from an RS 125 .
Heres some other posts that might interest you .
Aprilia RS125 rave valve removal and refitting powervalve video , rs 125
aprilia RS 125 RAVE POWERVALVE RS125 PV information
Aprilia RS 125 rotax 122 power rave exhaust valve PV valve cable and spring + fitting kit
Aprilia RS 125 Rotax Powervalve Rave valve assembly operation video rs125
OK then to start with see our Tanks romoval posts and our battery removal posts to get down to see the PVservo .
You can buy Aprilia RS 125 Power parts from here
Aprilia RS 125 parts in the USA
Remove the battery try its the 8mm bolt shown
it then pulls out form the battery tray rubbers
undo both small allen head bolts at the top of PV servo
Now undo both allen headed bolts at the engine cylinder
unplug the wiring connector
you may need to prize the PV free as it will be coked up
the cable fitting side of PV `
servo and adjustment nut on servo