2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 127Get this manual

2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 127

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Power unit
NOTE: Loosen the locknut and adjust screw to slack off the tension, before remove the rocker arm shaft Be sure to keep the parts in the order as they were removed3 Remove the camshaft