Yamaha F15MHX Manuel D'entretien page 326

LOWR
BACKLASH MEASUREMENT (F15A/F9.9C)
8 Attach the backlash indicator onto
the drive shaft (12.8 mm in diameter).
Backlash indicator:
YB-06265/90890-06706
8 Attach the dial gauge onto the lower
unit and have the dial gauge plunger
contact the mark on the backlash
indicator.
Base plate:
YB-07003/90890-07003
Dial gauge set:
YU-03097/90890-01252
Magneto base:
YU-34481/90890-06705
8 Slowly turn the drive shaft clockwise
and counterclockwise. When the
drive shaft stops in each direction,
measure the backlash.
2. Adjust:
9 Forward gear backlash
Remove or add shim(s).
NOTE:
Adjust the shim(s) to be added or removed
according to specification.
Forward gear
backlash
Less than
0.19 mm (0.007 in)
More than
0.86 mm (0.034 in)
Available shim thickness:
0.10, 0.12, 0.15, 0.18, 0.30,
0.40 and 0.50 mm
Reverse gear
1. Measure:
9 Reverse gear backlash
Out of specification → Adjust.
Reverse gear backlash:
0.95 ~ 1.65 mm (0.037 ~ 0.064 in)
6-24
E
Shim thickness
To be decreased by
(0.53 -measurement)
2.3
To be increased by
(Measurement - 0.53)
2.3