APRILIA Pegaso 650 I.E., Service Manual

Page: 136 / 320

FUEL SUPPLY SYSTEM
4 - 24
Pegaso 650 I.E.
4.9.10 CO ADJUSTMENT
Carefully read 0.5.1 (PRECAUTIONS AND GENERAL
INFORMATIONS) and 1.2.1 (FUEL).
For the maintenance intervals, see 2.1.1 (REGULAR
SERVICE INTERVALS CHART) under:
– Carburation, CO adjustment
The cylinders must be synchronized whenever the engine
runs smoothly no longer when idling.
◆
Ride for a few miles until reaching the normal running
temperature.
a
CAUTION
The CO adjustment must be carried out with warmed-
up engine:
– coolant temperature 78 °C (173 °F);
– room temperature 20-30 °C (68-86 °F).
NOTE
Have the appropriate special tools
m
to hand:
– aprilia part# 8140196 (exhaust fume analyser) (1).
a
WARNING
Fuel vapours are noxious for your health.
Before proceeding, make sure that the room in which
you are working is properly ventilated.
Do not inhale fuel vapours.
Avoid any contact of the fuel with the skin.
Do not smoke and do not use naked flames.
Do not dispose of fuel in the environment.
◆
Unscrew and remove the two screws (3).
◆
Remove the protection element (4).
Cap (5) driving torque: 25 Nm (2.5 kgm).
◆
Unscrew and remove the cap (5) on exhaust pipe.
NOTE
Upon reassembly, applyLOCTITE
®
8150 to the
plug cap (5).
◆
Connect the exhaust gas tester pipes (2):
– the rigid pipe to the appropriate coupling on the ex-
haust pipe;
– connect the other pipe to the exhaust gas tester (1).
◆
Start the engine and make sure the idling rpm is 1350 ±
100 rpm. If this is not the case, adjust accordingly, see
2.9.2 (IDLING ADJUSTMENT).
◆
Check the tester (1) for the CO values. They should
correspond to the values indicated.
◆
If the CO value measured differs from the value indicat-
ed, restore the correct value by means of the trimmer
(6).
◆
Check the idling rpm and, if it does not correspond to
1350 ± 100 rpm, adjust accordingly, see 2.9.2 (IDLING
ADJUSTMENT) and then check the CO values again
and, where necessary, repeat the previous procedure.
NOTE
If it is not possible to obtain the preset CO val-
ues, the sparking plugs must be replaced, see 2.6
(SPARK PLUG).
NOTE
CO values for the idling speed adjustment =
1% (tolerance: +1%, -0.5%) at 1350 ±100 rpm.
Release 00/2002-02
- 00