1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 35Get this manual
2-9 PERIODIC MAINTENANCE (5) Rotate crankshaft clockwise to bring cam nose vertical to shim surface90
(6) Measure tappet clearances by inserting thickness gauge between cam and shim surfaceTappet clearance (cold engine condition)IN: 0.18 0.24 mm (0.007 0.009 in EX: 0.18 0.24 mm (0.007 0.009 in 09900-20803Thickness gauge