If the display function does not work, replace the meter unit.

Check 3-6: Neutral Indicator Light (LED) Inspection
Meter Unit Circuit (ZX1000J Model)Air Cleaner Housing Assembly
Install the ducts to the air cleaner housing.
Fit the projections [A] of the duct into the slits [B] on the
air cleaner housing.
Tighten the screws [A].
Torque - Air Cleaner Housing Duct Screws: 1.1 N·m (0.11
kgf·m, 10 in·lb)
Install:
Air Cleaner Gasket [A]
Duct [B] ...
Air Intake Duct Disassembly
(Other than US, CA and CAL Models)
Remove:
Air Intake Duct (see Air Intake Duct Removal)
Seal [A] and Screen [B]
Turn the air intake valve actuator [C] counterclockwise
(90°).
Remove the shaft [A] of the air intake valve actuator.
Remove:
Pad [A]
Screws [B]
Air Intake Valve [C]
...
Valve Clearance Adjustment
To change the valve clearance, remove the camshafts
(see Camshaft Removal in the Engine Top End chapter)
and valve lifters.
Replace the shim with one of a different thickness.
NOTE
Mark and record the locations of the valve lifters and
shims so that they can be reinstalled in their ...