Fuel Filter "2; Electro-Injectors "3 - MOTO GUZZI CALIFORNIA JACKAL Werkstatt-Handbuch

A
B
C
D
E
F
G
H
I
L
M
N
O
P
10
A
B
5

FUEL FILTER "2"

The filter is equipped with a paper filtering element, with
a surface area of about 1200 cm2, and a filtering capacity
of 10 µm: these features are essential, given the injectors'
high sensitivity to foreign bodies.
The filter is fitted under the fuel pump between the pump
and the throttle body units and has an arrow on its external
casing which indicates the fuel flow direction.
Disassembly:
See chapter 2, section D.
6

ELECTRO-INJECTORS "3"

The injector controls the fuel quantity delivered to the
engine. It is an "all or nothing" device, in that it only has
two modes: open or closed.
The injector is composed of a body and a jet needle which
is integral to the magnetic armature.
The jet needle is pressed onto the restraining seat by
means of a helical spring whose load is determined by
an adjustable thrust spring.
The winding is housed in the rear part of the body. The
injector snug is machined in the front part (retaining seat
and guide for the needle).
The control pulses established by the ECU create a
magnetic field which attracts the armature and causes
the injector's opening.
This time is determined by the control ECU according to
the engine's conditions of use. Fuel metering is activated
in this way.
Finally, from a hydraulic point of view, upon a fuel
compression of 3±0,2 bar, the jet brakes down as soon
as it comes out from the nozzle (atomizing), thereby
forming a cone of about 30°.
Resistance value: 12 ohm.
If you want to carry out an electrical test on the injector,
apply a maximum voltage of 6 V for very short times.
Disassembly:
• Remove the throttle body as described in chapter 9 in
this section;
• Unscrew the two fastening screws "A" and remove the
electro-injector assembly "B".
F
UEL SYSTEM