-
A liSht
deposit
due to
any of these
causcs
can easily
be
cleaned
off, but if
it is
allowed to
accumulate,
particularly
inside the
body,
the
ptug
may spark
internally with
an
adverse
effect
on engine
perfoftnanc€-if,
indeed, ir does
not stop
the
engine
altogether.
The
plugs
should
be
cleaned
and resled
at regllar
interuals,
and
it is suggested
rnar rhrs
servtce
be
pertbrmed
at
your garage
on a special
'Air Blast'service
unit.
lfeventually
the
cleaning
process
Ialls to
restore
lhe
plug
!o
ils
original
condition
of
emcieDcy,
it should
be
replaced
by a new
one.
Fig. 15.
Sc
ing the
plug
pornrs
.
When
lnsp€oting
a
plug.
also check
the
gap
between
the
poinrs.
This
shoutd
be .018-.020
in.
(.45_.50
mm.)
and adjustment
should
be
made by
bending
the side wiri
Gee
Fig.
l5).
Neyer åtfempt
to moye
Oc
centre
electuode,
and it is
alwaJs
ad'"isable
to
use lhe
special
plug
gap
rooi
lrusrmteo.
obtalnatrle
at 2/_
trom
any
Champion
plug
stockist
or
from lhe
Champion
Sparking
plug
Co. Ltd.
Felrham,
Middlesex.
Feelei
gauges
are
atrached
to vcrify
conect
gap.
When
refittinS
a
plug,
make
slrle that
the
copper warsher
0;t:,
34
35
is
not defective in
any
way.
If
it has become worn and
flattened,
fit a new one to €nsure a
gastightjoillt.
Screw
the
plug
down
by hand
as far as
possiblq
then
use
a spanner for tightening only. Always use a tubular
box
spanner to avoid
possible
fiact$e of the insulator
and
do notin any
circumstances
use an adjustable spanner
Paint splashes, accumulation of
grime
and dust- etc.,
on tle top half of the insulator are
often responsible for
poor plug pcrformance.
Plugs should
be wiped fre4uenlly
with a clean rag.
Air
Cleån€r
(when
fitted to
Comp.
or Plunger
models).
This being of the oil dip typc, needs to be
dismantled and
cleaned
periodically.
The filter ele&ent
should be washed
thoroughly in
petrol,
allowed to dry,
and then submerged
in light engine oil for a few minutes.
Then take out, allow
the surplus oil to drain of and .eassemble.
Atu
Cleåner
(fitted
to swinging arrn machhes). This
is
in
front
of lhc battery cårrier, and is coupled
to the
carburetter by means of a rubber
elbow. The filter
element must be remov€d
periodicålly
when it should be
washed thoroughly
in
petrol,
dried, and then submerged
in thin oil
(SAE20)
for
a
few
minutes. Theo take
out,
allow the surplus oil
to drain
ofr and
reassemble.
This
operation
is
carried out
as
follows:-
The Cleaner cover is attached by
two sqews in elongated
slots, the lower to the frame member
below the seat and
the
other
to the
battery
strap. The rubber connection to
the
carburetter
should
be
left in
position
on the carburetter
inlet
stub and
slipped off the cleaner cover.
The
ltlter
is
held
in the cleaDer cover by a wire circlip.
Note:
The domed surface of the
p€rforated
retaining
disc
must be
replaced upwards.
Cylinrler
Head. After the machine
has covered its 6rst
250
miles
from
new or after decarbonising, check
the
tightness
of the
cylinder head
bolts.
If they
need to
be
tightened work in diagonal order to ensure that
the head
is tightened evenly, otherwise distortion may result.
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