Ignition System - MOTO GUZZI Le Mans 850 Additions And Changes To The Workshop Manual

IGNITION SYSTEM
MAINTENANCE, CHECKING AND ADJUSTMENT
DF DOUBUO CONTACT BREAKER
MAINTENAIICE
Every 3000 km
Lightly moisten the cam felt .. 0" with some
engine oil drops.
Checking (fig. 377)
- Remove the contact breaker cover by undo-
ing the securing screws.
- If contacts "A,. (right cylinder) and .. 8 . (left
cylinder) are dirty and greasy, clean them with
a petrol moistened rag . Should the contacts in
any way be damaged, replace them.
- Check points gap of contacts .. A .. (right cyl-
inder - red cable) and ,, 8 .. (left cyli nder - green
cable) which must be between 0,37 -:- 0,43.
Main t ••
turn
of doubl. contact breaker
Points gap
Contact pressure
Opening angle
Closing angle
Breaker arm angle
Automatic advance diagrarr'f
0,37 -+- 0,43 mm
550
±
50
gr
180'
± S-
180'
± 5"
225"
±
1"
see
fig . 161
AdJustment of contact points for right cylinder
(red cable) (fig. 328)
Rotate the breaker shaft to bring the points to
max. openi ng, then fit the blades of feeler gauge
.. A .. partn. 12909090 between the points and
check that the gap is as specified (mm 0,37
+
-;- 0,43).
In case of uncorrect gap, loosen screws .. B- and
.. C .. and turn the plate ..
0 ..
to the left or to the
right, acting on the notch ..
E.
with a screw
driver, so to obtain the correct gap.
Adjustment of contact points for left cylinder
(green cable) (fig. 329)
Same as by the right cylinder ones except of:
loosen the screws .. S-C .. and turn the plate .. 0 _
acting on the notch with a screw driver, so to
obtain the correct gap.
IGNITION TIMING OF RIGHT CYLINDER
(RED CABLE) (fig. 330)
- Connect the supplying clamp of the unit .. A_
to the red cable and the ground clamp .. 8,. to
one crankcase fin.
- Using a wrench .. C.. rotate the generator
clockwise until , looking throug h the inspection
hole, the letter .. 0" on the flywheel (right cyl-
inde r) is ali gned with the cente r mark of the
inspection hole rim " E .. ; the piston must be at
T.O.C. (closed valves) .
- Rotate the generator counterclockwise until
the mark on the flywheel .. AF .. (fixed advance)
is aligned with the center mark of the inspection
hole rim " E".
At this stage the ind icator of the unit ., FlO starts
moving clockwise.
If the indicator does not start moving at the
specified point, loosen the screws secu ring dou-
ble contact breaker to crankcase using the pro-
per wrench 14927000 (13 fig.330) and turn
the breaker to the left or to the right until the
indicator of the unit .,FlO starts moving at the
specified point.
The ig nition timed ,lock the screws securing the
double contact breaker and detach the clamps.
IGNITION TIMING OF LEFT CYLINDER
(GREEN CABLE) (lig.331)
The right cylinder (red cable) timed, adjust the
ign ition timing of the left one (green cable).
Operations are the same as by the ignition tim-
ing for the right cylinder except of the following :
- connect the supplying clam
"G.
to the green
cable ...
- using a wrench "C.. rotate the generator
clockwise until, looking through the inspection
hole rim
., E •...
If the indicator of the unit .. F
..
does not start
moving at the specified point loosen the screws
using screwdriver ..
H. and
turn the plate to the
rig ht or to the left until the indicator starts mov-
ing at the specified point.
IGNITION DATA
Initial advance (static)
Automatic advance
Full advance
Breaker contact points gap
SPARK PLUGS
s·
26·
34·
mm 0,37
+
0,43
Recommended spark plug types:
- BOSCH 230 T 30
- CHAMPION N 9 Y
Points gap mm 0.5
To c lean use: gasoline, wire brush. needle for
inner clea ning.
In re-fitting the spark plugs, ensure Ihey .r.
property slarted by hand for a lew turns, com-
pleting the operation by means of the proper
wrench in the tool kit. Should the spark plugs
not be properly
started, the threading on the cyl-
inder head may get stripped.
For all events, the spark plugs have to be replac-
ed every 10.000 km even if they appear to be in
good condition.
'95