2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 163Get this manual
Power Unit Mechanical: Identification of Oversize PistonPiston Ring One oversize pistonpiston ring components, 0.50 mm is availableOversize pistonpiston ring are marked as shown, belowPiston Oversize 0.50 mm I.Dmark 50 Piston Visual inspection Inspect piston for faults, cracks or other damageDamaged or faulty piston(s) should be replaced 1D-52
Piston ring to groove clearance Before checking, piston grooves must be clean, dry and free of carbonFit piston ring into piston groove, and measure clearance between ring and ring groove using thickness gaugeIf measurement exceeds service limit, replace piston andor piston ringSpecial tool (A): 0990020803 (Thickness gauge)
I9J011140062-02
"A": I.Dmark: 50
Piston ring to groove clearance Standard (1st): 0.030 0.070 mm (0.0012 0.0028 in Standard (2nd): 0.020 0.060 mm (0.0008 0.0024 in Service limit (1st): 0.12 mm (0.0047 in Service limit (2nd): 0.10 mm (0.0039 in