1996-2006 Yamaha 115-140HP Outboards Service Manuals, Page 952Get this manual
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LOWR SHIMMING (REGULAR ROTATION MODELS)6-58 SHIMMING (REGULAR ROTATION MODELS) (FOR USA AND CANADA) 6-59 SELECTING THE PINION SHIMS 6-59 SELECTING THE FORWARD GEAR SHIMS 6-61 SELECTING THE REVERSE GEA