1991+ Kawasaki 650 SC Factory Service Manual, Page 90Get this manual
7-12 ENGINE BOTTOM END
Crankshaft Runout
.Checkcrankshaft alignment by measuring runoutOWith the crankshaft on blocks [Al, rotate the crankshaft slowly and measure runout at each of the locations shownIf the runout at any point exceeds the service limitthe crankshaft must be either replaced or rebuilt