Suzuki 2002-2005 DF4/DF5/DF6 4-Stroke Outboards Service Manual, Page 80Get this manual
POWER UNIT 6-13 Valve stem deflection If unable to measure the valve guide inside diameter, measure the "Valve stem deflection"09900-20602Dial gauge 09900-20701Magnetic stand 1Install the valves into the valve guide2Lift the valves 10 mm off seat3Move the valve head in the direction "XY" and measure the deflectionValve stem deflectionService limitINEX 0.35 mm (0.014 in) If the measurement exceeds the service limit, replace the valve andor the valve guide NOTE: For the valve clearance replacement, see the "VALVE GUIDE REPLACEMENT" section on the page 6-17