2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 160Get this manual
8-14 ENGINE BOTTOM END Cylinders and Pistons
Piston Ring and Ring Groove Wear
(see Piston Cleaning) Clean the pistonthe piston rings and ring groovesVisually inspect If the piston rings are worn unevenly or damaged, replace themIf the ring grooves are worn unevenly or damaged, replace both the piston and piston ringsMeasure the clearance between the top and second rings and their grooves using thickness gauge [A]If the piston ringgroove clearance is greater than the specified value, replace the pistonPiston RingGroove Clearance Standard: Top, Second 0.04 0.08 mm (0.0016 0.0031 in Service Limit: Top, Second 0.18 mm (0.0071 in