Very nice !! I found one a few yours back in about the same condition and immediatly set out to "supertune" it. As mentioned, 25 pilots tend to be a bit fat and the 85 mains seem to be on the "safe" side as well. I put in 82.5's which did clean it up a bit more and it maintained 100% reliability as well. All of this applys with a Stock airbox.
Chances are that your clutch will slip when it comes on the pipes. What cured mine of this nuisance was new Kawasaki plates which now have aluminum structures insted of plastic, and a set of Barnett springs with stock well scuffed steels. Avoid Barnett plates at all costs(my opinion, thats all).
With a good clutch and a good tune up, you'll be rather impressed to say the least every time you twist the gas. Check this out (black helmet is the S2A)
http://youtu.be/OSR35ZmJhk4