Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 376Get this manual

Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 376

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BACKLASH MEASUREMENT (FT9.9D)
Adjust the shim(s) to be added or removed according to specificationReverse gear backlash

Shim thickness

To be decreased by Less than (1.1