Yamaha F25A Service Manual

6-32
E
LOWR
SHIMMING
2. Adjust:
● Forward gear backlash
Remove or add shim(s).
Forward gear
backlash
Shim thickness
Less than
0.31 mm (0.021 in)
To be decreased
by (0.51 – M) × 0.49
More than
0.72 mm (0.028 in)
To be increased by
(M – 0.51) × 0.49
Available shim thickness:
1.0, 1.1, 1.2, 1.3, and 1.4 mm
Reverse gear
1. Measure:
● Reverse gear backlash
Out of specification → Adjust.
Reverse gear backlash:
0.93 ~ 1.65 mm (0.037 ~ 0.065 in)
Measuring steps:
● Set the shift shaft in the reverse posi-
tion.
● Load the reverse gear by installing the
propeller without the collar 1 and
then tighten the propeller nut.
T
R
.
.
Propeller nut:
5 Nm (0.5 m • kg, 3.6 ft • lb)
● Attach the backlash indicator onto the
drive shaft (16 mm diameter).
Backlash indicator 2:
YB-06265/90890-06706
● Attach the dial gauge onto the lower
unit and have the dial gauge plunger
contact the mark on the backlash indi-
cator.

Yamaha F25A Specifications

General

Brand	Yamaha
Model	F25A
Category	Outboard Motor
Language	English