Yamaha VMX12H Supplementary Service Manual page 172

MIDDLE GEAR SERVICE
Middle Gear Lash Adjustment
1. Attach:
Middle Drive Gear Holder
This tool will prevent the drive axle from
turning.
2. Install:
Bolts (three)
On driven bearing housing.
Fi
nger-tighten the bolts.
NOTE:
Clearance between the crankcase and driven bear-
ing housing should be about 2 mm.
Measure gap with Feeler Gauge
3. Position:
Dial Gauge
On the outside edge of U-joint.
NOTE:
Be sure the gauge is positioned over the center-
line of the yoke bearing hole.
4.
Rotate:
U-joint
Move it gently back and forth.
5.
Measure:
Gear lash
Over specification
Under or same specification
check for faulty parts and/or reassemble
bearing housing.
Middle Gear Lash:
0.05
Do not hammer the U-joint or the collapsible
collar of the driven pinion gear may be distorted.
This will result in a change in the standard start-
ing torque, requiring replacement of the col-
lapsible collar and reassembly of the driven gear
assembly.
NOTE:
Check the gear lash a t four positions. Rotate the
U-joint 90 degrees each time and repeat the
gear lash check.
(YM-33222)
(YU-03097)
Follow next steps.
Incorrect;
-
0.12 mm (0.002 0.005 in)
3-48