Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 206Get this manual
BACKLASH (REGULAR ROTATION MODELS)
BACKLASH (REGULAR ROTATION MODELS) 6
NOTE: Do not install the water pump components when measuring the backlash Measure both the forward and reverse gear backlashes If both the forward and reverse gear backlashes are larger than specification, the pinion may be too high If both the forward and reverse gear backlashes are smaller than specification, the pinion may be too low
MEASURING THE FORWARD GEAR BACKLASH
1Measure: Forward gear backlash Out of specification AdjustForward gear backlash 0.190.40 mm (0.0070.016 in) Measuring steps (1) Set the shift rod into the neutral positionShift rod wrench YB-0605290890-06052 (2) Install the propeller shaft housing puller so it pushes against the propeller shaft6645