Ignition System; Automatic Advance - MOTO GUZZI V1000 G5 Workshop Manual

24.6 IGNITION SYSTEM
Twin contact breaker (fig. 189)
Testing data :
Make
Rotation
Voltage
Automatic advance
N. of cylinders
Condensors capacity ..
F ..
VOltage
test
Marelli S 311 B
Counterclockwise
12V
3'"
2
0.25
Check dielectric rigidity by testing with A.C. at 500 V,
50 Hz
for
3
seconds
Main features
Contact pOints gap
Contact pressure
Open ing angle
Closing angle
0 .37-0.43 mm
(.0014-0016")
550
gr.
±
50
ISO' ± 5'
180'
±
5'
Tim ing angle between points 225'
±
l '
Automat ic advance diagram (dwg . f;g . 196)
24.7 AUTOMATIC ADVANCE
It
consists of centrifugal masses suitably shaped and
pivoted on the pins of the carriers in unit with the
spindle.
The masses start opening at a predetermined num-
ber of revolutions. Through the special cavity In
them, they drag the pins on the plate in unit with
the cam and cause an angular displacement of the
cam itsel f In respect of the spindle on which the
specially prolonged pin stops. Mass return is obtai-
ned by the aid of spiral springs hooked to the spin-
dles and their rest position is also determined by
the pin on reaching the slot in the plate.
At each engine speed corresponds a number of pre-
determined ignition control points in accordance
with a curve (advance curve) which is defined in
function of the eng ine speed itself. The advance
group Is Incorporated in the double contact breaker.
24.S CAPACITORS (fig. 189)
Marelli make. type CE 36 N
Connected In parallel with the breaker points, their
purpose Is to more abruptly cut off the current and at
the same time to dampen the strong sparking effect
resulting from the opening of the primary circuits.
The capacitor consists of two tin foils insulated by
interposed paper strips rolled up and immerged in
a special insulating liquid in an airtight container.
One of the foils is connected internally to the metal
cap container while the other is connected to an
Insulated terminal. The capacitor is part of the con-
tact breaker un it.
'89
'35