2009 Yamaha F40 Outboard Service Manual, Page 224Get this manual
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Camshaft and valve
Cylinder head anode screw A: Nm (0.2 kgfm, 1.5 ftlb) Cylinder head anode plugs z: 18 Nm (1.8 kgfm, 13.3 ftlb) Spark plug B: 18 Nm (1.8 kgfm, 13.3 ftlb)
Make sure