Factory adjustment marks are not always accurate. You can do it the poor mans way and use some string and a little imagination.

This site used to have really good pics, but I dont know what happened to them. http://www.motorcycle.com/mo/mcnuts/chassis.html

Good read anyway.
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Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
MY BIKE PICS