1996-2006 Yamaha 115-140HP Outboards Service Manuals, Page 86Get this manual

1996-2006 Yamaha 115-140HP Outboards Service Manuals, Page 86

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CYLINDER, PISTON AND CRANKSHAFT
- Apply two stroke outboard motor oil to the bolt thread-lighten the head bolt in sequence with two steps specified torque
Cylinder head bolt: 1st step: 15.