2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 178Get this manual
IpOWRIIfriJ: IPower unit 2Calculate the taper limitReplace or rebore the cylinder body if out of specificationTaper limitmaximum of or O2 minimum of or0.08 mm (0.003 in) Piston ring dimensions: Top ringB: 1.17-1.19 mm (0.046-0.047 in) T: 2.39-2.41 mm (0.094-0.095 in) Second ringB: 1.47-1.49 mm (0.058-0.059 in) T: 2.49-2.51 mm (0.098-0.099 in) Oil ringB: 2.34-2.46 mm (0.092-0.097 in) T: 2.75 mm (0.108 in)
Calculate the out-of-round limitReplace or rebore the cylinder body if out of specification
Out-of-round limitmaximum of, orminimum of O2 ,04or0.08 mm (0.003 in)
Level the piston ring CD in the cylinder with the piston crown of an inverted pistonCheck the piston ring end gap at the specified measuring pointReplace if out of specification