Adjustments; Alternate Ratios (Options); Tools - Yamaha WR450F 2-TRAC Supplementary Owner's Service Manual

ADJUSTMENTS

The pulling force, at a given circumstance, can be varied by changing the rear wheel
sprocket up or down one tooth. If we increase the no by one tooth the pump rotates
faster in relation to the hydraulic motor, thereby increasing the pressure in the system
and increasing the pulling force of the front wheel. It must be understood that even the
reaction forces in the handlebar increases. From experience the gain is negligible.
When decreasing with one/two/three teeth the pulling force is reduced. The advantage is
that the steering feels lighter and, on most ground conditions, there is no increased lap
times, but can be preferable during long endurance races.
WARNING
Changing the number of teeth of the sprockets more than one tooth up causes unduly high reac-
tion forces in the handlebar. It can also give permanent damages to the hydraulic transmission
because of raised oil temperature in the transmission and increased wear.
Changing the number of teeth in the pump transmission without changing the rear-wheel
ratio also can cause permanent damage to the hydraulic transmission.

ALTERNATE RATIOS (OPTIONS)

There are alternate ratios for the pump transmission.
Alternate ratios kit
GTYA E00
GTYA E01
The kit contains:
Chain-sprocket pump
–
Chain-wheel pump
–
Chain
–
– Chain guide
– Collar
– Screw chain-sprocket
NOTE:
More ratios will be available later.

TOOLS

A specially designed puller tool is demanded to remove the pump sprocket. Refer to
"SPECIAL TOOLS".
Pump transmission ratio
15/22 standard
12/20 P-D
3
Rear wheel ratio
14/50
15/47