2003 Kawasaki KLF250 Service Manual., Page 93Get this manual
4-34 ENGINE TOP END Cylinder and Piston
PistonCylinder Clearance
Subtracttothe piston diameter from the cylinder inside diameter get the pistoncylinder clearancePistonCylinder Clearance Standard: 0.020 0.047 mm (0.0008 0.0019 in
Piston Ring and Ring Groove Wear
Check for uneven groove wear by inspecting the ring seating