2015 Kawasaki KX250F Owners Manual - Page 193

192 TUNING 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 it is difficult to set the machine so it is best • Since suited for all portions of the circuit, determine which circuit portions will have the greatest effect 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. j the course has long straight portions, the sec• If ondary reduction ratio should be reduced so that then the course has many corners or uphills or • If is wet, the secondary reduction ratio should be the machine speed can be increased. • • 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.