2022 Kawasaki KX450 Rear Suspension (UNI TRAK)
Rear Suspension (UNI-TRAK®)
NOTICE
Sticking mud or dust on the sliding surface of the rear shock absorber could damage the oil seal, leading to an oil leak. Clean the sliding surface after each ride.
This motorcycle’s rear suspension system is called “UNI-TRAK®” and consists of a rear shock absorber unit, a swingarm, two lever rods, and a lever. The operating characteristics of the UNI-TRAK® suspension are similar to those of the front fork. However, a linkage system is used to achieve progressive springing characteristics. The spring preload of the shock absorber can be adjusted or the spring can be replaced with an optional one to suit various riding conditions. In addition, the damping force can be adjusted easily, making it unnecessary to change the oil viscosity.
Rebound Damping Adjustment
To adjust the rear shock absorber rebound damping, turn the rebound damping adjuster at the bottom of the rear shock absorber with a flat-head screwdriver.
NOTICE
Do not force the rebound damping force adjusters beyond the fully seated position, or the adjusting mechanism may be damaged.
A. Rebound Damping Adjuster
B. Punch Mark
If the damping feels too soft or too stiff, adjust it in accordance with the following table.
Rebound Damping Adjuster Settings
A. Seated Position (Adjuster Turned Fully Clockwise)
B. Punch Mark
Standard Rebound Damping Adjuster Setting 1 1/2 turns out Out from the fully seated position
NOTE
The punch mark position of your rear shock absorber may be different from the illustration.
Spring Preload Adjustment
- Set up the side stand.
- Remove the seat and both side covers.
- Loosen the air intake duct clamp screw.
- Remove the air cleaner case bolts.
- Remove the rear frame and air cleaner case.
- Raise the rear wheel off the ground using a jack (a special tool).
- Using the hook wrenches (special tools), loosen the locknut and turn the adjusting nut as required.
- Turning the adjusting nut down increases the spring preload.
A. Adjusting Nut
B. Locknut
C. Hook Wrenches (P/No.57001-1101)
The standard adjusting nut position from the center of the upper mounting hole and the adjustable range is as follows:
A. Adjusting Nut Position
B. Locknut
C. Adjusting Nut
- Tighten the locknut securely.
- After making the adjustment, move the spring up and down to make sure that it is properly seated.
- Install the parts removed.
- Tighten the rear frame mounting bolt to 34 N m (3.5 kgfm, 25 ftlb).
Optional Rear Shock Absorber Springs
Various rear shock absorber springs are available to achieve suitable rear shock absorber action in accordance with the rider’s weight and track condition. A harder spring stiffens the shock absorber action and accelerates the rebound damping. A softer spring softens the shock absorber action and slows down the rebound damping.
WARNING
Improper removal or installation of the rear shock absorber spring may cause the spring and/or related parts to be ejected at high velocity. Always wear eye and face protection when working on the rear shock absorber. Removal and installation of the rear shock absorber spring should be performed by an authorized Kawasaki dealer.