Kawasaki KX250F - Owner's Manual - page 192
191
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Gearing
Selection of the Secondary Reduction Ratio
(Rear Sprocket)
Rear Sprocket Selection According to Course
Conditions
Fast Course
Small sprocket
Many Curves or Hills
Sandy or Soft Ground
Large sprocket
•
If the course has long straight portions, the sec-
ondary reduction ratio should be reduced so that
the machine speed can be increased.
•
If then the course has many corners or uphills or
is wet, the secondary reduction ratio should be
increased so that gear shifting and acceleration
are smooth.
•
Since the speed must be changed depending on
the ground condition on the day of the race, be
sure to run through the circuit prior to a race and
tune the machine accordingly.
•
If there is a long straight portion of the course on
which the machine can be run at maximum speed,
the machine should be set so that the maximum
speed is developed toward the end of the straight
course, but care should be taken not to over-rev
the engine.
•
Since it is difficult to set the machine so it is best
suited for all portions of the circuit, determine
which circuit portions will have the greatest ef-
fect on lap time, and tune the machine to these
portions. Confirm your settings by recording lap
times after each change. In this way the machine
will deliver best performance for the entire circuit.