•
••
•
cooling system service
Check
ai
r
intake
sc
ree
n before each s
tart-
up and make sure
it
is
clean
and unobstructed.
If
grass
cl ipp
in
gs, leaves,
dirt
etc.
star
t bui ldulg up on
in
ta
ke screen w
hi
le
oper
ating
, s
top
engine and· clear
to
prevent
overheating. Cooling
air
is
drawn
in
to the
bl
ower housing by f
in
s on
th
e fl
ywhe
el and
is
circulated
past
cooling
fins
on block and heads and i s then discharged toward
the
power
tak
e-off
end
of
the engule . Do not operate wi
th
missing co
oling
shrouds as
these
direct
coo
ling
air--removal would
re-
su
lt
in
improper
air
circulat
ion
and
possible
engine
damage
due t o overhe
at
ing. Clean ex
ternal
surfaces
of
your engine occasiona
ll
y as accumulat ion
of
dust , oi l can cont r ibu
te
to
im
pro
per
coo
li
ng.
Ignition system service
Engine
misfire
or
generally
poor
operation
is
often
caused by spark plugs
in
poor co
ndition
or with
incorrect
spark gap se
tting.
Always
c
lean
area
around spark plugs before re
moving
to prevent
dirt
from
getting
into
engine .
Carefull
y note spark plug condi
tion
as
this
is
often
a good
indicator
of
t he
ign
i -
tion
trouble.
Plugs
fail
for
various
reasons. The porcela
in
insula
tor
may
crack or
become
coated
w
ith
oil,
carbon or o
ther
depo
sits.
This can cause the high vol t age igni
tion
impulse to pass from
the
center
electrode
to ground wi
thout
jumpUlg
the
spark gap.
As
an engine o
perate
s,
the
electrodes
are
gradually
burned
or
worn away. In t ime ,
the
gap
becomes
so wide t hat the a
vailable
ignition
voltage
cannot
jump
the gap and
the
engine misses .
Opera
tion
is
also
greatly
a
ffected
by
breaker
point con
dition
and adjustment
of
poi
nt
gap. If
points
are
burned or badly ox
idized,
l i
ttle
or
no
curre
nt
w
ill
pass and as a
result
the engine
may
not
operate
at
all
,
or
if
i t does
run,
it
is
likely
to
miss
particularly
at
full
throt t l e.
SPARK
PLUGS:
Every 100 hours
remove
p
lugs,
check
condition
and
reset
gap or
replace
plug
if
needed.
Good
operating
conditions
are
indicat ed i f plug has
light
coating
of
gray or
tan
deposi
t.
A dead
white,
blistered
coating
could
in
di
cate
overheating. A
black
(carbon) coa
ting
ma
y
indicate
an
"overrich"
fuel
mixture caused by clogged
ai
r
cleaner
or improper carbure
tor
adjustment. Do
not
sandblast,
wi re brush,
scrape or
othe
rwise
service
plug
in
poor condi
tion
--bes
t
resu
lts
are
obtained w
ith
new
plug.
SPARK
PLUG
SIZE
TYPE
GAP
TIQ-ITEN TORQ
UE
14mm
III0
. 035
18 - 22 f t . Ibs .
RHIO
.025
H
EAV
Y
GA
UGE
#4 OR #6
GA.
BRE
AK
ER
P
OI
NTS
-.;;:-
12 VOLT
BATTERY
+
CONDENSER
01---------'
CO
IL
ST
AR
TE
R
Af.'
METER
,..-------,
SP
A
RK
PL
UG
RE
GU
LA
TOR
F
USE
&
HOLDER
FIGURE
4 -
WIRING
DlAG
RAM
FOR
15 AMP
ALTERNATOR
-
BATIERY
IGN
ITI N
SYSTEM
6
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