Yamaha GCH I 237 Owner's Manual page 76

Periodic maintenance and adjustment
1. Rear axle nut
2. Lift the rear of the snowmobile onto a
suitable stand to raise the drive track off
the ground.
3. Start the engine and rotate the drive
track one or two turns. Stop the engine.
4. Align the drive track by turning the left
and right adjusting nuts.
Drive track Shifted to
alignment
Left adjusting
nut
Right adjust-
ing nut
1. Left adjusting nut
2. Right adjusting nut
68
Shifted to left
right
Turn out Turn in
Turn in Turn out
Shifted to right
1. Forward
2. Gap
3. Slide runner
4. Drive track
5. Slide metal
Shifted to left
1. Forward
2. Gap
3. Slide runner
4. Drive track
5. Slide metal
5. Adjust the drive track deflection to spec-
ification. NOTICE: The right and left ad-
justing nuts should be turned an equal
amount.
[ECS00593]
Drive track More than
deflection specified
Left adjusting
nut
Right adjust-
ing nut
Less than
specified
Turn in Turn out
Turn in Turn out