Gilera Nexus 500 Workshop Manual page 224

Injection
THE THROTTLE BODY IS A PART WHICH INCLUDES VARIOUS COMPONENTS AND IS USUAL-
LY SUPPLIED COMPLETE. TO TEST THESE COMPONENTS SEE THE "INJECTION" CHAPTER.
- Remove the 3 retaining screws indicated in the
figure.
CAUTION
THE THROTTLE BODY COMES PRE-CALIBRATED. TAMPERING WITH THE THROTTLE STOP
REGISTER IS TO BE ABSOLUTELY AVOIDED. THIS REGISTER HAS BEEN SEALED FOR THIS
PURPOSE. FOR PROBLEMS WITH IDLING SEE THE "INJECTION" CHAPTER.
N.B.
REMOVAL OF THE THROTTLE BODY CAN BE EFFECTED WITH THE MANIFOLD ON OR OFF
THE ENGINE.
- Make sure the seal rims on the coupling surfaces
between the manifold-throttle body and manifold-
head are in good condition.
CAUTION
IF AIR GETS IN IT CAN JEOPARDISE THE OP-
ERATION OF THE INJECTION SYSTEM, ESPE-
CIALLY WHEN THE ENGINE IS IDLING.
- Make sure the throttle valve and related conduit
are clean.
- Make sure the supplementary air channel man-
aged by the stepper motor is clean.
N.B.
IF THE THROTTLE BODY IS REPLACED RESET THE T.P.S. AND ADJUST THE CO%.
ONCE THE ENGINE IS REPAIRED CHECK THE CO% VALUE WHILE IDLING TO MAKE SURE IT
IS WITHIN THE PRESCRIBED VALUES.
IF THE CO% IS NOT IN CONFORMITY, PROCEED WITH CALIBRATION AS DESCRIBED IN THE
ADJUSTING IDLE CARBURETION CHAPTER.
throttle body
Upon analysing the material sent and covered by the warranty, it seems several throttle bodies have
been mistakenly replaced due to valve fouling. Dirt deposited on that valve, mainly on the inlet manifold
INJEC - 32
Nexus 500