Yamaha FT50C Service Manual page 167

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 7: 90890-06705
5. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
Forward gear backlash:
0.12–0.45 mm (0.005–0.018 in)
6. Add or remove shims if out of specifica-
tion.
Forward gear
backlash
Less than
0.12 mm (0.005 in)
More than
0.45 mm (0.018 in)
M: Measurement
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
7. Remove the special service tools from
the propeller shaft.
62Y5A11
Shim thickness
To be decreased by
(0.29 – M) × 0.57
To be increased by
(M – 0.29) × 0.57
Shimming / Backlash
1
2
3
4
5
6
7
8
9
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