2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 180Get this manual

2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 180

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Lower unit Reverse gear backlash: 0.951.66 mm (0.03740.0654 in) 15 Adjust the current shim thickness if the reverse gear backlash is out of specificationReverse gear backlash
12 Tighten the prop