Measuring The Middle Gear Backlash - Yamaha 2004 YXR660 Service Manual

MIDDLE GEAR
MEASURING THE MIDDLE GEAR
BACKLASH
1. Measure:
• gear lash
Middle gear lash
0.1 ~ 0.3 mm (0.004 ~ 0.012 in)
M MMM M MMM M M MMM M
a. Temporary install the left crankcase.
b. Wrap a rag 1 around a screwdriver 2, and
then insert it into the installation hole 3 of
the right crankcase speed sensor to hold
the middle driven gear.
c. Attach the gear lash measurement tool 4
and dial gauge 5.
Gear lash measurement tool
P/N. YM-01467, 90890-01467
a 6.7 mm (0.26 in)
d. Measure the gear lash while rotating the
middle driven shaft back and forth.
NOTE:
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 by middle driven pinion gear shims
and/or middle drive pinion gear shim(s).
L LLL L LLL L L LLL L
4 - 98
ENG
M MMM M M MMM M M MMM M MMM
L LLL L L LLL L L LLL L LLL