Yamaha F25A - Backlash Measurement; Forward Gear

6-30
E
LOWR
SHIMMING (EXCEPT FOR USA AND CANADA)
3. Select:
● Reverse gear shim(s)
Calculated numeral
Shim size to
use
More than or less than
1.00 1.10 1.0
1.10 1.20 1.1
1.20 1.30 1.2
1.30 1.32 1.3
Available shim thickness:
1.0, 1.1, 1.2, and 1.3 mm
BACKLASH MEASUREMENT
NOTE:
● Do not install the water pump compo-
nents when measuring the backlash.
● Measure both the forward and reverse
gear backlashes.
● If both the forward and reverse gear back-
lashes are larger than specification, the
pinion gear may be too high.
● If both the forward and reverse gear back-
lashes are smaller than specification, the
pinion gear may be too low.
● If either of these conditions exist, then
check the pinion gear shim(s) selection.
Forward gear
1. Measure:
● Forward gear backlash
Out of specification → Adjust.
Forward gear backlash:
0.31 ~ 0.72 mm (0.012 ~ 0.028 in)