2009 Yamaha F40 Outboard Service Manual, Page 212Get this manual
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Cylinder head
Cylinder head bolt ah (M9): 1st: 12 Nm (1.2 kgfm, 8.9 ftlb) 2nd: 23 Nm (2.3 kgfm, 17.0 ftlb) 3rd: 90 Cylinder head bolt il (M6): 1st: Nm (0.6 kgfm, 4.4 ftlb) 2nd: 12 Nm (1.2