2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 148Get this manual
1D-37 Power Unit Mechanical: Valve guide inside diameter Using small bore gauge, measure valve guide inside diameterValve guide inside diameter Standard (IN: 5.500 5.512 mm (0.2165 0.2170 in Standard (EX: 5.500 5.512 mm (0.2165 0.2170 in Valve stem end Inspect valve stem end face for pitting and wearIf pitting or wear is found, valve stem end may be resurfacedUse caution when resurfacing, do not grind away stem end chamferWhen chamfer has been worn away, replace valve I9J011140041-01
I9J011140040-01
Valve guide to valve stem clearance Standard (IN: 0.020 0.047 mm (0.0008 0.0019 in Standard (EX: 0.045 0.072 mm (0.0018 0.0028 in Service limit (IN: 0.070 mm (0.0028 in Service limit (EX: 0.090 mm (0.0035 in Valve stem deflection If unable to measure valve guide inside diameter, check "Valve stem deflection"If measurement exceeds service limit, replace valveIf measurement still exceeds service limit with new valve, replace valve guideMeasure valve stem deflection as follows; 1) Install valve into valve guide2) Position valve head at approx5 mm away from valve seat3) Move valve head in the direction "a" "b", and measure deflectionSpecial tool (A): 0990020606 (Dial gauge) (B): 0990020701 (Magnetic stand) Valve stem deflection Service limit (IN: 0.14 mm (0.0055 in Service limit (EX: 0.18 mm (0.0071 in