Yamaha 115-225 HP Outboards Service Manual, Page 155Get this manual
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MEASURING THE BACKLASH NOTE:
1The measurement should be made without water pump components2Both forward and reverse gear backlash should be measured3After the measurements, recheck pinion shim selection if both of the backlashes are greater or smaller than their specificationsYU-3097 YB-7003
YU-34481