Measuring The Middle Gear Backlash; Adjusting The Middle Gear Backlash - Yamaha FJR13AG Service Manual

EAS30410
MEASURING THE MIDDLE GEAR
BACKLASH
1. Measure:
• Middle gear backlash
Out of specification → Refer to "ADJUSTING
THE MIDDLE GEAR BACKLASH" on page
5-74.
Middle gear backlash
0.10–0.20 mm (0.00–0.01 in)
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a. Hold the middle drive shaft "1".
b. Install the gear lash measurement tool "2" as
shown.
c. Make sure the dial gauge plunger contacts
the measuring point "a" on the gear lash mea-
surement tool as shown.
Gear lash measurement tool
90890-01467
Gear lash measurement tool
YM-01467
a. 14 mm (0.55 in)
d. While gently turning the middle driven shaft
back and forth, measure the middle gear
backlash.
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5-74
TIP
Measure the middle gear backlash at four posi-
tions. Rotate the middle driven shaft 90° each
time and observe the reading on the dial gauge.
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EAS30411

ADJUSTING THE MIDDLE GEAR BACKLASH

1. Loosen:
• Middle driven shaft bearing housing bolts
2. Remove:
• Middle driven pinion gear shim(s)
3. Tighten:
• Middle driven shaft bearing housing bolts
Middle driven shaft bearing hous-
ing bolt
25 Nm (2.5 m·kgf, 18 ft·lbf)
ECA14050
NOTICE
Do not overtighten the middle driven shaft
bearing housing bolts or you may obtain too
little middle gear backlash and damage the
middle gears. If the bolts are overtightened,
loosen them until the crankcase-to-middle-
driven-shaft-bearing-housing clearance is
within specification, as stated below. Then,
repeat all of the previous steps.
TIP
• Tighten the middle driven shaft bearing hous-
ing bolts carefully, one thread turn at a time on-
ly. Push in the middle driven shaft bearing
housing and then tighten the bolts to specifica-
tion.
• After tightening the middle driven shaft bearing
housing bolts, loosen them until the clearance
between the crankcase and the housing is ap-
proximately 2 mm (0.08 in), when measured
with a thickness gauge "1".
4. Hold the middle drive shaft.
5. Turn:
• Middle driven shaft
MIDDLE GEAR
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