Yamaha 250GETO Service Manual page 200

LOWR
11. Turn the shift rod to the neutral position
d with the shift rod push arm.
12. Turn the drive shaft counterclockwise
approximately 30°.
d
13. Turn the shift rod to the reverse position
c with the shift rod push arm.
14. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
c
NOTE:
When measuring the reverse gear backlash,
turn the shift rod push arm towards the
reverse position c with force.
Reverse gear backlash:
0.64 – 0.93 mm
(0.0252 – 0.0366 in)
6-63
Lower unit
6S360510
6S360510
15. Add or remove shim(s) if out of specifica-
tion.
Reverse gear
backlash
Less than
0.64 mm (0.0252 in)
More than
0.93 mm (0.0366 in)
M: Measurement
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
16. Remove the special service tools, and
then install the water pump assembly.
Shim thickness
To be decreased by
(0.79 – M) × 0.78
To be increased by
(M – 0.79) × 0.78
6S35H11