Unless they were sold this week Kawasaki still has some left. I have a Kawi log in and can check stock on them which they listed them Active and limited quanity. You are correct on the rod though its long gone.The powervalves are now discontinued. The rod has been discontinued for years. I have all these parts on ebay, super clean. I will make a deal off ebay for a much better price.
Kawasaki Tecate 4 KIPS Power Valve Governor Rod KXF250 : eBay Motors (item 330395645442 end time Feb-14-10 10:53:31 PST)
KIPS Exhaust Power Valve set Kawasaki Tecate 4 KXF250 : eBay Motors (item 330399475793 end time Feb-26-10 11:04:29 PST)
These are my last clean OEM powervalve parts