2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 158Get this manual
8-12 ENGINE BOTTOM END Cylinders and Pistons
Piston Installation
[A] in the piston oil Install the expander[B] touch together, ring groove so that the expander ends never overlapInstall the upper and lower steel railsThere is no UP or Down to the railsThey can be installed either way
mix up the top second rings Do notthe second ring andthat the notched edge [A] faces so Install downtop ring Install the should turn freely in the groovesThe rings Piston Head [B] Top Ring [C] Second Ring [D]
Align the piston and rings with the piston ring end gap as shownArrow Match Marks [A] Top ring End Gap, Upper Steel Rail End Gap [B] About 45 [C] Second Ring End Gap, Lower Steel Rail End Gap [D]