2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 149Get this manual
Power Unit Mechanical: Valve head radial runout Measure valve head radial runoutTo measure runout, rotate valve slowlyIf measurement exceeds service limit, replace valveSpecial tool (A): 0990020606 (Dial gauge) (B): 0990021304 (Steel "V" block set)0990020701 (Magnetic stand) Valve head radial runout Service limit: 0.08 mm (0.0031 in (A)
Valve seat contact width Measure valve seat contact width as follows: 1) Remove all carbon from valve and seat2) Coat valve seat evenly with prussian blue (or equivalent)3) Install valve into valve guide4) Put valve lapper on valveSpecial tool (A): 0991610911 (Valve lapper)
I9J011140043-03
Valve head thickness Measure thickness "a" of valve headIf measurement exceeds service limit, replace valveSpecial tool0990020101 (Vernier calipers (150 mm)) Valve head thickness Standard (IN: 0.75 mm (0.03 in Standard (EX: 0.95 mm (0.04 in Service limit (IN: 0.5 mm (0.02 in Service limit (EX: 0.7 mm (0.03 in