Measuring The Middle Gear Backlash - Yamaha YXR70FX Service Manual

4
3
b
MIDDLE GEAR
2. Tighten:
• middle drive pinion gear nut 1
TIP:
Secure the middle drive shaft in the vise with a
clean rag.
3. Lock the threads with a drift punch.
EBS01022
MEASURING THE MIDDLE GEAR
BACKLASH
1. Measure:
• gear lash
Middle gear lash
0.10 ~ 0.30 mm
(0.004 ~ 0.012 in)
M MMM M MMM M M MMM M
a. Temporarily install the right crankcase.
b. Wrap a rag 1 around a screwdriver 2, and
then insert it into the installation hole a of
the right crankcase speed sensor to hold
the middle driven gear.
c. Attach the gear lash measurement tool 3
and dial gauge 4.
Gear lash measurement tool
90890-01467, YM-01467
b 12.3 mm (0.48 in)
d. Measure the gear lash while rotating the
middle driven shaft back and forth.
TIP:
_
Measure the gear lash at 4 positions. Rotate
the middle driven gear 90° each time.
e. If the gear lash is incorrect, adjust the gear
lash with middle driven pinion gear shims
and/or middle drive pinion gear shim(s).
L LLL L LLL L L LLL L
4 - 106
ENG
New
190 Nm (19.0 m · kg, 140 ft · lb)
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L
MMM
LLL