2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 95Get this manual
ENGINE TOP END 4-13 Valves
Operating Procedures Clean the seat area carefullyCoat the seat with machinist's dyeFit 45 cutter to the holder and slide it into the valve guidePress down lightly on the handle and turn it right or leftGrind the seating surface only until it is smooth
CAUTION
Do not grind the seat too muchOvergrinding will reduce valve clearance by sinking the valve into the headIf the valve sinks too far into the head, it will be impossible to adjust the clearance, and the cylinder head must be replaced