cooling system service
Che
ck
air
intake
scr
een b
efor
e each st art -up and
make
sure
it
is
clean and unobstructed.
If
grass
clipp
ings, leaves,
dirt
etc.
start
building
up on intake
screen
while
operatin
g, st op engine and
clear
to prevent ov
erheating
. Cooling
air
is
drawn
into
the
blower hou
sing
by
fins
on
the
flywhe
el
and
is
circul
ated
past
coolin
g
fins
on block and heads and i s then
dis
charged toward
th
e
pow
er
t
ake-off
end of
the engine . Do n
ot
ope
rat
e
with
missing cool ing shrouds as
th
ese
dir
e
ct
coolin
g
air--r
emoval would re-
sul t
in
improper
air
circulation
and po
ssibl
e engine
dama
ge due to overhe
ating.
Clean
external
surfaces
of
your engine occa
sionally
as acc
um
ul at ion of
dust,
oil
can
contribute
to improper cool ing .
•
••
•
Ignition system service
Eng
in
e
misfire
or
generally
poor
operation
is
oft
en caused by spark
plu
gs
in
poor
condition
or
with
incorre
ct
spark gap s
etting.
Always
clean
area
ar
ound spark plugs
before
r
emo
ving to prev
ent
dirt
from
getting
into
engine.
Carefull
y n
ote
spark
plu
g condi t ion as
this
is
often a good
indicator
of t he
igni
-
tion
tr
ouble. Plugs
fail
for
va
riou
s
reas
ons. The porc
elain
insul
ator
may c
ra
ck or
become
coated
with
oi l , carbon or
other
depos
it
s.
This can
ca
use
the
hi gh
volta
ge
ignition
impulse to pass from
the
center
el
e
ctrod
e t o ground without jumping
the
spark gap.
As
an engine
operat
es,
the
ele
c
trodes
are
gradually
burned or worn away. In time,
the
gap bec
omes
so wide
that
the av
ailabl
e
ignition
vo
lta
ge cannot
jump
the gap and
th
e engine misse
s.
Oper
ati
on i s
al
so grea
tl
y
aff
e
cted
by
breaker
point
condi
tion
and
ad
j
l~
tme
n
t
of point gap.
If
point
s
are burned or badly o
xidiz
ed, l i t t
le
or no current
will
pass and as a resul t the eng
in
e
ma
y not op
erate
at
all,
or
if
it
does run,
it
is
lik
el
y
to
miss
particul
arly
at
full
thr
ottle.
SP
ARK
PLUGS:
Every 100 hours
remove
plugs,
check c
ondition
and
reset
gap or replace plug
if
needed.
Go
od o
peratin
g
conditi
ons
are
indicat
ed
if
plug has
li
ght
coat ing
of
gray or tan de
posit.
A dead whit
e,
bli
ster
ed coa
ti
ng could
indicat
e ov
erheating.
A
bl
ack (carbon)
coatin
g may indic
ate
an "overricW'
fuel
mixture caused by clogged air c
le
aner or improp
er
carburetor adjustment. Do not sandb
la
st , wire brush,
sc
ra
pe or
oth
erwise s
ervice
plug
in
poor condi t ion- -best
re
sult
s
ar
e obtained wi th n
ew
plug.
SPARK
PLUG
SIZE
14mm
TYPE
III0
nno
GAP
.035
.025
TI
GI-ITEN
TO
UE
18 - 22
ft.
lbs.
HEAVY
GAUGE
#4
OR
#6
GA.
BREAKER
POINTS
12
VOLT
BATTERY
+
CONDENSER
COIL
STARTER
Of---------'
Ar-IMETER
,....-----,
SPARK
PLUG
AC
REGULATOR
FUSE
&
HOLDER
FI
GURE
4 - WIR
ING
DIA
GRAM
FOR
15
AMP
ALTERNATOR
-
BATIERY
IGNITI
ON
S
YS
TEM
6
To Next Page
Loading...
