1986-1991 Kawasaki 650 X-2 Service Manual, Page 60Get this manual
5-10 ENGINE TOP END -Visually inspect the piston pin hole and connecting rod small end holeIf the piston pin hole shows uneven wear, replace the pistonIf the rod small end hole shows uneven wear, replace the rod, or crankshaft assembly-Visually inspect the outer surface of the piston pinIf the pin shows color change or stepped wear, replace the pin and needle bearing