1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 159Get this manual
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CAMSHAFT AND VALVES
13.5 Nm (1.4 kg, 10.0 ft Ib)
18.0 Nm (1.8 m' kg, 13.3 ft Ib) 30 mm (3)
REMOVAL AND INSTALLATION CHART
Step ProcedurePart name CAMSHAFT AND VAL