2003+ Suzuki DF9.9/DF15 four stroke outboard motors service manual, Page 186Get this manual
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LOWER UNIT 8-21
1.1, 1.2, Reverse gear thrust 1.5, 1.6, washer 1.9 Reverse gear back 0.7, 0.8, up shim 1.1, 1.2,
FOREWARD GEARPINION GEAR
Step to prior to adjustment Correctly