Kawasaki Sportsbike Riders Club - Australia - Online Forum

If your exhaust is quite dark (rich) then they won't hurt, maybe even help, but if your exhaust is running as grey as a ghost then you need to address the tune and do not run hotter plugs.

I just went thru similar recently, Kawa dealers quote you high on individual parts, ebay usa or uk for relatively priced kits or my local bike wrecker for a decent 2nd hand caliper.
I dare say if the caliper is that bad you may as well get the complete system off a running bike, by the time you ...