From the past 50 years my observations have been ,, don't measure any Honda semi auto clutch plates steel or fiber (: For the fiber plates replace them, for the steel plates if they look burnt or have obvious wear lines replace them. but for the most part the steel plates just need the face surfaces ruffed up with emery cloth or what i like is to run them through the sand blaster. No matter how much too thin the plates measure if the center hub spins in both directions it is put together wrong period thanks jack 317M