Suzuki 2002-2005 DF4/DF5/DF6 4-Stroke Outboards Service Manual, Page 91Get this manual
6-24 POWER UNIT Piston ring to groove clearance Before checking, the piston grooves must be clean, dry and free of carbonFit the piston ring into the piston groove, and measure the clearance between the ring and the ring groove using the thickness gauge09900-20803Thickness gauge Piston ring to groove clearance Standard1st2nd 0.03 0.07 mm (0.001 0.003 in) Service limit1st2nd 0.12 mm (0.005 in) If the measurement exceeds the service limits, replace the piston andor the piston ringPiston ring groove width Standard1st2nd 1.22 1.24 mm (0.048 0.049 in) Oil 2.51 2.53 mm (0.099 0.100 in) Piston ring thickness Standard1st2nd 1.17 1.19 mm (0.046 0.047 in)