Synchronizing The Cylinders - APRILIA RST mille Futura 2001 Service Manual

FUEL SYSTEM

4.10.4 SYNCHRONIZING THE CYLINDERS

Carefully read 1.3.9 (PRECAUTIONS AND GENERAL
INFORMATION), see 1.4.1 (FUEL).
The cylinders need to be synchronized when the engine
no longer idles smoothly. The cylinders must be
synchronized before adjusting the CO, see 4.10.5
(ADJUSTING THE CO).
Ride a few miles until the engine reaches normal
running temperature.
WARNING
The cylinders must be synchronized when the engine
is warm:
coolant temperature 167-194 °F (75-90 °C);
ambient temperature 68-86 °F (20-30 °C).
NOTE
Have the vacuum gauge (1) ready
8140256).
DANGER
Gasoline fumes are harmful to your health.
Before proceeding, make sure that the work area has
adequate ventilation.
Do not inhale the fuel fumes.
Avoid skin contact with the gasoline.
Do not smoke or use open flames.
Always dispose of
environmental regulations.
Raise the fuel tank, see 2.8 (LIFTING THE FUEL
TANK).
Pull out the two free tubes (2) on the left side of the
motorcycle, under the side panel.
Unplug the two free transparent lines (2) and connect
them to those of the vacuum gauge (1), using two 6-
mm fittings.
Completely close the two by-pass screws (3) on the
throttle body.
Start the vehicle and read the value for the front
cylinder on the vacuum gauge (1), with valve (4) open
and valve (5) closed.
Close the valve (4) and open the valve (5) on the
vacuum gauge (1), and read the pressure value for the
rear cylinder.
If the values are different between the two cylinders,
adjust one or both of the by-pass screws (3) to
synchronize.
Loosen the by-pass screw (3) on the cylinder with the
higher pressure, until it falls to the same level as the
other cylinder, with a tolerance of ± 5 millibar.
4
- 18 -
00
(code
fuel in compliance
4
with
RST mille
USA
1
5
3
2
Release 00/2002 - 03