Replace it if necessary.

Inner Tube Inspection
Spring Tension InspectionTroubleshooting guide
Engine Does Not Start
Starter Motor Won’t Turn
Engine stop switch off
Transmission not in neutral
Fuse blown
Battery leads do not make good electrical
contact with battery terminals
Battery discharged
Engine Cranks, But Won’t Start
No fuel in tank
Fuel line clogged
Fuel ...
Axle Inspection
Remove the front and rear axles (see Front/Rear Wheel
Removal).
Visually inspect the front and rear axle for damages.
If the axle is damaged or bent, replace it.
Place the axle in V blocks that are 100 mm (3.94 in.) [A]
apart, and set a dial gauge [B] on the axle at a point
halfway ...
Front Fork Inspection
Holding the brake lever, pump the
front fork up and down several times
to inspect smooth stroke.
Visually inspect the front fork for oil
leakage, scoring or scratches on the
outer surface of the inner tube.
If any doubt about the front fork, it
should be checked by an authorized
K ...