I agree with Stargate. Since you seem to be running rich right now, there's a good chance it'll be fine after you install the new exhaust.
If you do need to rejet, give the Kawasaki shop a call first to make sure they'll even work on your bike. There are an awful lot of shops these days that won't touch bikes more than 10 years old, and that refuse to tune carbureted bikes, probably because they don't have anyone on staff anymore who knows how to. (I mean, why should a young mechanic have to get his fingers dirty when he can just hook up a laptop and upload a new EFI map?)
--mark
|