and to earth on the engine (5). Activate the
starter and see in the instrument if the spark
jumps.
3 If the test has a positive result, clean the elec-
trodes (2) with compressed air and adjust the
distance to 0.6-0.8 mm. Remount the spark
plug and tighten it to the specified levels.
Otherwise, check the system parts as described
in point “B”.
B) Adjusting the air gap and checking the coil
11 Remove the conveyor with the tank [ 6.1.A
]
12 Make sure that the cable faston is not oxidized;
if it is, disconnect, clean and remount it, spray-
ing it with a special antioxidant.
13 Check that the black earth cable (11) of the coil
(12) is intact and that the insulation is not
crushed due to incorrect assembly.
The black spark plug cable should not have any
cracks or signs of deterioration or burns which
reduce its efficiency and insulation level.
14 Loosen the two screws (13) securing the coil
(12), release the brake manually and rotate the
flywheel (14) until the magnetic inserts are lined
up with the poles of the coil core (12).
15 Insert a 0.35 mm thickness gauge (15) between
the flywheel (14) and the coil poles. Push the
coil until the poles come in contact with the
thickness gauge and secure both screws (13).
Tighten the screws remembering that the air
gap must be between 0.25 and 0.40 mm.
NOTE
An accurate inspection of the efficiency of a coil can
only be carried out in a laboratory equipped with a
oscilloscope. To make a brief check, proceed as fol-
lows:
16 Disconnect the faston of the black earth cable
(11) and reposition the upper conveyor to acti-
vate the starter.
SV 150
6.6.0
IGNITION SYSTEM
2 / 3
WORKSHOP MANUAL
page
from
2004 to ••••
01/2005
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