You should be able to pull 12v off the blue wire from the banshee voltage regulator or the yellow wire out of the stator. Brown wire on the Ypvs box is 12v positive, black is ground, Black/Yellow is ypvs signal.
The ypvs wont have a battery to start the cleaning cycle, I may be able to scrounge a smoothing
capicator off a WR200 to run the ypvs.
After owning a number a yamahas with electric powervalves, Some things noticed are:
On 800/1200/1300 cc waverunner/jetboat engines , the powervalve cleaning cycle is done a few
seconds after engine shutdown. There is no seperate ypvs controller, its built into the CDI.
Ypvs controllers from TZ , RZ's and some RD's are all pretty much the same.
IF you want a nice rubber cover for your servo motor, get one off a waverunner servo
or a 1992 WR200. They cost about 10$, and really keep the grime out.
Part # for the WR200 cover is 34X-85825-00-00.
YPVS servo motors can be used from the R1, waverunners, WR200 RZ's and TZ's
Im also awaiting an update to this page : http://ypvsbox.free.fr/ypvsbox_en.html
This guy is designing a programmable ypvs controller, and already has software up on his site.
I have also heard that a zeeltronic ypvs controller could be triggered off the coil signal.