62
V.
ELECTRICAL
2.
IGNITION
SYSTEM
Fi
g.
S- 2
(2)
I
(8)
( 1) Battery (2) Fuse
(3)
Main
switch
(4)
Ignition switch
(7) Contact breaker (8)
Spark
plug
(4)
_....__
(8)
7-
(3) (2)
(5) Ignition coil (6) Condenser
The
ignition
system consists
of
an
ignWon
coil. condenser, contact
breaker,
spark
plu~
and
some
electrica)
wirings
to connect
them
electrically.
The ignition coil
has
1wo
windings. a primary winding
and
a secondary winding. Current from the bancry flows through the
primary winding when the con1ac1 breaker points close. The contact breaker
is
operated by one
of
cams integrated wilh the
camshaft
In
operation>
as
the
contact
breaker
points close.
the
current
flows
in
the
primac}'
windjng,
building
up a
rnagnelic
field.
As
the points open, the current stops
11owing.
This collapses the magnetic field; i.e., high voltage
is
induced in the secondary
winding,
As
a resul
t.
the high voltage surges Oow
to
the spark plugs in the engine cylinders. These surges
in
curn
produce
the
electric
spark at the spark plug
gap
to
ignite the air-fuel mixture compressed in the engine cylinde
r.
TI1e
operation
of
the spark advancer
is
dependent upon a centrifugal governor. The unit alters the breaker
cam
angle in
relation
to
the
camshaft to
advance
or
re1ard
the
ignition timing automatically
according
to
the
engine
speed
Ignition coil
Spark plug
Contact breaker
Condcnl)Cf
Spark
advancer
oint spark gap opening 6mm (0.24 in.) ,nin.
3-p
Type
Plug gap
Point gap
Spring force
Capacity
Insulation
re
sistance
Start
uf
advance (crankshat
·1
rpm)
Ill)
Full advance (crankshaft rp
NGK
D-8ES·L
0.6
0.
7mm {0.024
0.028-in)
0.3- 0.4,nm (0.0 I 2- 0.016-iIL)
700
900
gr.
0.3 I' F
-:i:
I
0%
-
!OM
12
min. (With 1.000 megger)
1,800 rpm
3,600
rpm
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