1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 169Get this manual
POWER UNIT 6-26 Manifold seating faces distortion Using straightedge and thickness gauge, check cylinder head to manifold seating facesManifold seating faces distortion Service limit0.10 mm (0.004 in If measurement exceeds service limit, resurface or replace cylinder headWater jackets Check water jacketsIf clogged or obstructed, clean water jackets
CAMSHAFT Cam face Inspect cam face for scratches and wear
Cam wear Using micrometer, measure cam height H09900-20202Micrometer Cam height Standard: DF40 IN EX DF50 IN EX