Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 202Get this manual
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CRANKCASE, CRANKSHAFT AND CAMSHAFT
Bolt1st :10 Nm (1.0 mkg, 7.2 ftlb) 2nd:22 Nm (2.2 mkg, 16 ftlb)
Make sure tightening sequence is observed as shown