Introduction
No area of machine adjustment is more critical than proper suspension tuning. An improperly tuned suspension will keep even the best rider from attain- ing the full benefit of his machine’s ability. Match the suspension to the rider and the course conditions. WHILE TUNING THE SUSPENSION, KEEP THE FOLLOWING IMPORTANT POINTS IN MIND:
Front Fork Oil Level –
The fork oil level in the fork tube is adjustable. A change in the fork oil level will not affect the spring force much at the top of fork travel, but it will have a great effect at the bottom of it.
Fork Oil Level Effect on Fork Stroke
A. Weight
B. Fork Stroke
C. EX: 300 mm (11.8 in.)
D. Increase Level
E. Standard Oil Level
F. Decrease Level
Changing the fork oil level works effectively at the end of fork travel. If fork bottoming is experienced, raise the fork oil level. This will change the secondary spring rate.
Fork Oil Level Adjustment
Adjust the fork oil level (see Front Suspension section).
Troubleshooting Improper Settings
Listed below are some symptoms of improper suspension settings and the most likely means of correcting them. The proper settings can be achieved by applying the information given in this chapter in a scientific, methodical manner. This does not mean, however, that you must be a scientist or trained technician to succeed. Simply take time to think about the changes you believe are necessary, check them against the symptoms and cures described here, make the changes in small increments, and take note of the changes and their effects.
Front Fork Improper Adjustment Symptoms
Spring too stiff:
The front fork dives excessively during braking and deceleration:
Rear shock absorber improper adjustment symptoms
Spring too stiff:
The front fork dives excessively during braking and deceleration:
Suspension Tuning According to Ground Surface
Suspension Tuning Experience According to Riding
Suspension Tuning According to Rider Weight
Suspension Tuning According to the Type of Course
Begin the actual on-track testing and evaluation after making these preliminary adjustments. Bear in mind the following points when readjusting the suspension.
Front and Rear Suspension Compatibility Inspection
Use this procedure to determine if the suspension
is balanced reasonably well.
A. Push Down
Although this is one of the most effective adjustment procedures, suspension settings may vary de- pending on the conditions at the track and the rider’s preferences.
Front End Surges Acceleration Out of Corner
The front suspension is too soft.
Front End “Knifes”or Oversteers in Turns (Tends to Turn Inward)
The front suspension is too soft.
NOTE
Heavier or expert riders may need a harder spring.
Front End Pushes or “Washes Out” in Turns (Front Wheel Tends to Push Outward Rather than “Bite” in a Turn)
The front suspension is too stiff.
NOTE
Lighter or less experienced riders may need a softer spring.
Front End Does Not Respond to Small Bumps in Sweeping Turns
The front suspension is too hard.
Rear End” Kicks” When Braking on Bumps-
The rear shock absorber rebound damping may be too low. Increase the rebound damping.
Rear Tire Does Not “Hook Up” Out of Corners (Lack of Traction Coming Out of Turns) –
The rear shock absorber may be too stiff.
High-speed Jump (harsh bottoming occurs once or twice per lap)
The front suspension is too soft.
NOTE
Check the front and rear suspension compatibility after making any adjustment.
Rear End Feels Soft on Bumps-
Rear End Bottoms After 3 or 4 Successive Jumps
Decrease the rebound damping
NOTE
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