MV Agusta F4 S Workshop Manual page 55

Twist off the plugs that close the vacuum tubes. The
number of the cylinder to which the rubber plug is con-
nected is written on the plug itself (A).
The vacuum tubes are located on the right and left side
of the vehicle.
Left side:
Cylinders 1 and 2
Right side:
Cylinders 3 and 4
Connect the measuring device with the rubber pipes.
Each pipe must match the cylinder to which it is con-
nected.
Fit the starter key and start the vehicle.
Once the system engine steadies, the throttle body will
begin pairing. For proper engine operation, adjust the
throttle body so as to allow the idle speed control to
work in "middle band".
To do this you must follow these instructions:
- check that all by-pass adjustment screws (1) of the 4
cylinders are pre-positioned at an opening of 1.5 turns
from the fully closed position
- choose the cylinder corresponding to the highest
column of the vacuum gauge
- tighten the by-pass screws of the other 3 cylinders
until the levels of the relative mercury columns are ali-
gned to the highest column. In this way it is possible to
obtain alignment of the low-pressure values on the four
in the four suction ducts.
The following positions are accepted for the by-pass
screws of all the cylinders:
IDEAL 1.5 turns (min 0.5 - max 3.5 turns)
In the event of a minimum by-pass opening of one of
the 4 cylinders of 0.5 turns, slightly open all screws rai-
sing all 4 columns (maintaining alignment) to find a
balance of minimum control, without exceeding the
maximum position allowed of 3.5 opening turns.
Maintenance
- 39 -
1
B