1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 175Get this manual
POWER UNIT 6-32 Valve stem runout Measure valve stem runout09900-20602Dial gauge 09900-20701Magnetic stand 09900-21304"V" block set Valve stem runout Service limit0.05 mm (0.002 in If measurement exceeds service limit, replace valveValve head radial runout Measure valve head radial runout09900-20602Dial gauge 09900-20701Magnetic stand 09900-21304"V" block set Valve head radial runout service limit0.08 mm (0.003 in If measurement exceeds service limit, replace valveValve head thickness Measure thickness of valve head09900-20101Vernier calipers Valve head thickness StandardIN 1.0 mm (0.04 in EX 1.15 mm (0.045 in Service limitIN 0.7 mm (0.03 in EX 0.5 mm (0.02 in If measurement exceeds service limit, replace valve