Yamaha F100B F100C Outboards Factory Service Manual, Page 177Get this manual
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Shimming (F100B)Backlash (F100B) Backlash indicator 4: 90890-06706 Magnet base plate 5: 90890-07003 Dial gauge set 6: 90890-01252 Magnet base 7: 90890-06705 6 Slowly turn the drive shaft clockwise and