Yamaha FT25B Manual De Servicio página 144

LOWR
BACKLASH
6640
(3) Install the backlash indicator onto the
drive shaft (on the 16 mm (0.63 in)
diameter portion of the drive shaft a).
Backlash indicator .................... 5
YB-06265 / 90890-06706
(4) Install the dial gauge onto the lower
unit and have the dial gauge plunger
contact the mark on the backlash indi-
cator.
Magnetic-base plate................. 6
YB-07003 / 90890-07003
Dial gauge set ........................... 7
YU-03097 / 90890-01252
Magnetic base........................... 8
YU-34481 / 90890-06705
(5) Slowly turn the drive shaft clockwise
and counterclockwise. When the drive
shaft stops in each direction, measure
the backlash.
2. Adjust:
• Forward gear shim
Remove or add shim(s).
Forward gear
backlash
Less than
0.23 mm (0.009 in)
More than
0.68 mm (0.027 in)
Available shim thickness
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
M: Measurement
– 60 –
E
Shim thickness
To be decreased by
(0.46 – M) × 0.44
To be increased by
(M – 0.46) × 0.44