Yamaha YFM660FS, Supplementary Service Manual

Page: 310 / 478

4 - 97
ENG
MIDDLE GEAR
MEASURING THE MIDDLE GEAR BACKLASH
1.Measure:
●
Gear lash
*****************************************************
Measurement steps:
●
Temporary install the right crankcase.
●
Wrap a rag
2
around a screwdriver
3
, and
then insert it into the installation hole
1
of
the left crankcase speed sensor to hold the
middle driven gear.
Middle gear lash:
0.1 ~ 0.3 mm (0.004 ~ 0.012 in)
●
Attach the gear lash measurement tool
3
and dial gauge
4
.
a
46 mm (1.8 in)
●
Measure the gear lash while rotating the mid-
dle driven shaft back and forth.
NOTE:
Measure the gear lash at 4 positions. Rotate
the middle driven gear 90° each time.
●
If the gear lash is incorrect, adjust the gear
lash by middle driven pinion gear shims and/
or middle drive pinion gear shim(s).
*****************************************************
Gear lash measurement tool:
P/N. YM-01467, 90890-01467