Yamaha 250GETO Service Manual page 165

3. Install the special service tools so that it
pushes against the propeller shaft.
3 2
NOTE:
While turning the drive shaft clockwise 5-6
times to contact the gear evenly it tightens
center bolt 3 to specified torque.
Center bolt 3:
5 N·m (0.5 kgf·m, 3.7 ft·lb)
Bearing housing puller claw L 1:
90890-06502
Stopper guide plate 2:
90890-06501
Center bolt 3: 90890-06504
4. Install the backlash indicator onto the
drive shaft (22.4 mm [0.88 in] in diame-
ter), then the dial gauge onto the lower
unit.
6S35H11
Shimming (regular rotation model)/Backlash (regular rotation model)
1
6S360190
5. Set the lower unit upside down.
NOTE:
Install the dial gauge so that the plunger a
contacts the mark b on the backlash indica-
tor.
Backlash indicator 4: 90890-06706
Magnet base plate 5: 90890-07003
Dial gauge set 6: 90890-01252
Magnet base B 7: 90890-06844
6. Slowly turn the drive shaft clockwise and
counterclockwise, and measure the
backlash when the drive shaft stops in
each direction.
Forward gear backlash:
0.13 – 0.45 mm
(0.0051–0.0177 in)
7. Add or remove shim(s) if out of specifica-
tion.
Forward gear
backlash
Less than
0.13 mm (0.0051 in)
More than
0.45 mm (0.0177 in)
M: Measurement
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
Shim thickness
To be decreased by
(0.29 – M) × 0.78
To be increased by
(M – 0.29) × 0.78
6-28
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