Throttle Body Fixing Screws - Gilera 633721 Workshop Manual

Nexus 500 euro 3
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
side, can be easily removed. Once clean, the throttle body guarantees an air flow exactly the same as
the original. Throttle valve fouling is phenomenon that happens at different times depending on how
the scooter is used, weather conditions and idle speed adjustment. This phenomenon can be easily
detected as a gradual poor idle signals it. Carry out a thorough check with a scooter diagnostic tester,
drw. 020460y. With engine temperature of at least 90°, the parameters may be as follows:
Engine revs
Ignition advance
Throttle valve opening
The error menu displays the signals stored in the "RPM sensor". This takes place only when the engine
stops with the key switch set to "on." An exhaust fumes analysis will show a very rich and non adjustable
idle carburetion (CO > 4% - CO2 < 12%). Measure with the tool in drw. 020625y. It is evident that,
except for cases of early fouling, cleaning should not be carried out when still covered by the warranty.
After cleaning the throttle body, check and, if necessary, adjust C0. If these indications occur when the
injection warning light turns on or further errors or wrong parameters are present, it is necessary to carry
out the relevant controls indicated in the manual. In such a case, there is a real fault evidently.
Refitting the butterfly valve
- Carry out the removal operations but in reverse
order, tighten the 3 fixing screws to the prescribed
torque.
Locking torques (N*m)

Throttle body fixing screws

Pump supply circuit
The control unit starts the pump in the following conditions:
- by setting the switch to «ON» with the emergency switch to «RUN» and side stand raised. The pump
does not supply.
Standard
1500±5
5°÷7°
5.24°
11 ÷ 13
Injection
Dirty throttle body
< 1400
10°
5.24°
INJEC - 215