Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 368Get this manual

SHIMMING (FT9.9D)
Forward gear shim

Find the forward gear shim thickness (T1) by selecting shims until the specified measurement (Mv1) is obtained with the special tool
1Measure: Measurement (Mv1) Shimming plate: 90890-06701 Digital caliper: 90890-06704

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