Th'eignit10n
is
,automatically
a<;:hvanced,
~nd
retat~e~.
by
means
of
a centrifugal
mecfiarii~~<
To time'
the
IgnitIon
,
'raise
out
the
f\y-weigh~i
there
,I~
no
~top'
that
ViOu~~
, limit, its movemel)t.
With
t~e:
autol)1atlc
q?vance-an
'retard
mechanism
in
this position,
and
the
piston
placed
'7'.6
mm
before
TDe;
the,
contact
_b~~aker'
should
.tust~.e
,"
on
the
point,
o,f
openif,lg. The
p'osltr<;>n
of.
the
plst?n,
If
'checked
in
th~
nor'l1')al
manner,
by inserting a'f
~trlP
h
" ,
metal
or
a'
wire, with a
mark
placed
7.6 mm
1'01)1,
t e
end
fhrough
the
plug hole. A fe'eler,
gauge,
0.03
to
0.05'
mm(0.0012"
to
0.0020")
thiC~
clampea'
between
the
contact-b'reaker
points
should
'lust,
become
.free
,01;d
'capable
of
being
w.it.hd~awn
~hen.
the
flyweights
,~nd
pi'ston
pre
i,n
the
posltlO~S
descrlb~d.
Do' not use
,a
piece
of
paper
betw,een
the
POints.
.'
,
'There
must'
be
no
'alteration
in
th-e' positiorl'
a!
the
pole,
, casing.
Before'
disinantli~g
Jhis ,i!em
~t
any
time, mak.e
certain
therefore,
t,hat
Its
'POSition
'IS
mar~ed,
add
h
lf
necessary
make
suitable
marks
on
the
casing
an
t e
crankcase
(see illustration
on
p. 57).,
The
contact
bre~ke'"
gap
'of
0.4
mm (0.016")
sh?uld
b
d
checked
when
a
new
machin'e
has
done
1200 miles
an
if
necessary
corrected*.
\,
'The
gap
a"
the
points
sho~ld,
be
.024"'.to
.~028"(0.,6
,;
to
07'
mm).
If
the
electrode
IS
bent,
bend
,I~
b~~k
to.
~l-ie
corr~ct
setting.
When
fitting a ney;' plug
obtam·
Sit
er
,
a
Bosc;:h
,W
,1.90
M
1'1
'S
or
an,equ!valent
plug
,~ade
by,
another\manufacturer.
.'
58
"
-~
.',
To'test
the,
sparking
plug, unscrew
it
from the,
~;Iinder
, .
, '
"head;
c;md
hold \
it
so
that
a non-insulated
part
(thread
or
hexagon)
is'
in
contact
with
the
cylinder,
head.
'When
,the
kic;;kstarter
is
depressed,
a
'spark
must jump
the
gap
between
the
electrodes.
.'
'I:n
the
event
of
intermittent firing
d,ue
to
,fouled
or
oily
. ,coJ;ltact
b~eaker
points,'
clean
these
by ,inserting bet- /
ween
them
a
clean
smooth
~trip,
of
tin tbe thickness
of
a
postcard
and
moving, it several' times to
and
fro.
In
fhe
course
of,time'
the"
conta'Ct br.eaker points will
become
piffed, ,L
e.
show
small' hign
and
low spots. These how- ,
ever, wi!l,
not
generally
interfere
with
goad
running.
If
ignition trol:lble'is
caused
by
badly
pitted contacts,.
these'
must
be
removed
,and
cleaned
up. on a oil
stone
(do
not
u,se
files 'or'
emery
paper).
After
th~
contact
points
have"
been
refac~d,
clean
them caref.ully with pet.rbl
to
remove
..
all
tra¢es
,of
oil
and
grease.
Toke
'care
not,'to
'
,
handle
the
'Fontacts
wit~
dj~ty,
fingers.
If
pitting
is
very
bad.,
and
wnen
the
machme
IS
being
completely
overh'au-
led,
,renew
the
contact
breaker
points.
Work
on
th'e
con~
,
tact
breaker
points; 'Work
on
the
contact
breaker
p0ints
,
is
b~st,left
to
a specialist service stat!on. f
'[
The' Bcittery*:-
has,
gn
output
of
7'
Ah
at
6 vo'tts.
Its
-maintenance'
IS
.
governed
by
the
general
rules. An essential point- to,
watch
at
regular
intervals
is
the
acid
level.
,Use, only distilled wa'ter.
Water
which
h~s,
merely
been
boiled
is
not
sati,sf<;Jctory"
since
it,
contains
metallic
ahd
.
chloride'
impurities which ma'y
'cause
.damage,
Make
.,.'
,c~rta'in
that
,there.is
a
good
earth
connection. The ter-
, mlna
Is
must
be'
kept,
clean,
on9
it
is
also
advisable,
to
,
,(
, "
",,'
See
Special'
I~struction
of
the
b~tte'ry
m"nuf~durer.
, ,
59
-r':'l:
I"
.'
"
"
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