2000-2005 Yamaha F40B Outboard Service Manual, Page 234Get this manual

2000-2005 Yamaha F40B Outboard Service Manual, Page 234

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CYLINDER HEAD
2 Measure: Camshaft journal diameter

Camshaft journal inside diameter Out of specification -7 Replace
Camshaft journal diameter #1 36.92536.945 mm (1.45371.4545