Gilera Nexus 500 Workshop Manual page 200

Injection
14 - After having modifying a trimmer value, wait
until the CO value becomes steady.
In case of incorrect adjustment, press OK to store
the value in the control unit memory.
YES go to 15
15 - Select «PARAMETERS» and «ECU DATA»
to confirm the new trimmer change has been stor-
ed.
N.B.
WHEN THE CO PERCENTAGE IS RIGHT AND THE CO2 PERCENTAGE DOES NOT FALL INTO
THE SPECIFIED VALUES, THE LAMBDA VALUE IS ALSO DISTORTED. IF THIS OCCURS, CARE-
FULLY CHECK THE EXHAUST SYSTEM FOR ADEQUATE SEALING.
When the CO percentage is correct and the HC (PPM) value exceeds the maximum limit allowed, check:
- spark plug
- valve clearance
- timing system phase
- outlet valves for sealing
When the control unit is replaced, reset TPS and pre-program the trimmer value of the original control
unit (if available) preventively.
In any case, check the CO value again.
N.B.
WHEN THE CO PERCENTAGE IS RIGHT AND THE CO2 PERCENTAGE DOES NOT FALL INTO
THE SPECIFIED VALUES, THE LAMBDA VALUE IS ALSO DISTORTED.
If this occurs, carefully check the exhaust system for adequate sealing.
When the CO percentage is correct and the HC (PPM) value exceeds the maximum limit allowed, check:
- spark plug
- valve clearance
- timing system phase
- outlet valves for sealing
When the control unit is replaced, reset TPS and pre-program the trimmer value of the original control
unit (if available) preventively.
INJEC - 8
Nexus 500