Yamaha VMX12H Supplementary Service Manual page 173

MIDDLE GEAR SERVICE
U
3-49
6. Tighten:
Bolt (Three)
Tighten carefully one-threadturn only. Push
in bearing housing and hold in position
while tightening bearing housing bolts.
Do not overtighten bearing housing bolts or you
may obtain too little gear lash and cause damage
to gears. If over tightened, loosen the
that crankcase/bearing housing clearance is
2
about mm (0.08 in) and repeat all previous
steps.
7. Repeat steps 4 and
is achieved.
Middle Gear Lash:
0.05 0.12 mm (0.002
8. Measure:
Crankcase/bear i ng housing clearance
Use a Feeler Gauge.
9.
Select:
By the following steps.
Example: Selection of the driven pinion gear
shim;
If the clearance is 0.46 mm.
shim can only be selected in 0.05 mm
increments, round off hundredths digit and
select appropriate shim
Hundredths
0. 1,2
3.4. 6
the example above, the measured shim
thickness i s 0.46 mm. The chart instructs
you, however, to round off the 6 to 5. Thus
you should use 0.15 mm and 0.30 mm
shims.
sizes are supplied in the following
thickness.
Driven Pinion Gear Shim
0.1 0
(mm)
Thickness
3 bolts so
5
until correct gear lash
0.005 in)
0
5
10
0.30
0.15
0.50 0.60