Suzuki 2003-2007 DF60 DF70 Outboard Motors Service Manual, Page 34Get this manual
PERIODIC MAINTENANCE
6Insert the thickness gauge between the valve stem end and the valve adjusting screw on the rocker arm09900-20803: Thickness gauge Valve clearance (when cold): IN 0.11 0.15 mm (0.004 0.006 in) EX 0.13 0.17 mm (0.005 0.007 in) If the measurement is out of the specification, adjust the valve clearanceADJUSTMENT 7Loosen the valve adjusting lock nut 18Turn the valve adjusting screw to bring the valve clearance to within the specification09900-20803: Thickness gauge