Suzuki DF25/DF30 Four Stroke Service Manual, Page 159Get this manual
7-42 POWER UNIT (3) Calculate the pistoncylinder clearance (Clearance equals difference between piston diameter and cylinder bore measurements Piston to cylinder clearance Standard0.020 0.040 mm (0.0008 0.0016 in Service limit0.100 mm (0.0039 in If clearance exceeds service limit, replace piston andor cylinder or rebore cylinder
Identification of oversize pistonpiston ring Two oversize pistonpiston ring components, 0.25 mm and 0.50mm, are availableOversize pistonpiston ring are marked as show, below Piston