Download  Print this page

Carburetor Adjustment - Craftsman 143.629012 Owner's Manual

Craftsman engines owner's manual
Hide thumbs

Advertisement

SERVICE AIR CLEANER
Your engine
is
equipped wi
t
h a dry type air
cleoner and
must be pe riodically
removed
and
cleaned
to maintain
maximum
engine pe
rform-
ance.
To clean,
loosen thumb screw thot hol ds ai
r f
ilte
r
cover to
bracket.
Lift cover from bracket,
t hen
proceed
as follows:
Pull
element
from brocket.
T
op element
lightly to dislodge accumulat-
ed dirt and
brush d
irt
from e
lement
. Do
not wash
element
in gasoline or other sol·
vent,
C lean the
cove
r
and b rocket wi
t
h
ga
soline
or
any solvent.
Reassemble.
(0)
Insert
element on bracket.
(b)
Place
cover on
bracket and
t
ighten
thumb screw.
It
is recommended
that
a
new air cleaner
element be purchased and installed
a
t
be-
ginning of each mowing season.
T
his
i
s
your best protection
against
excessive
en-
gine
wear.
NEVER RUN YOUR ENGINE WITHOUT AIR
CLEANER COMPLETELY
ASSEMBLED.
CARBURETOR ADJUSTMENT
Do
not make unnecessary
adjust
ments. Fac-
tory
set
tinAs are
correct
for most
applicat
ions.
If lIdjustments are needed p
r
oceed
as follows:
After
making
initial adjustments as
shown
below (Fig
.
3)
star
t
engine.
Turn
"High Speed
Adjusting Needle" for-
ward or bock
Va
turn at a
time
unt
il engine
runs
smoothly. If engine
tends to
stoll
when
unit is
in
use
open
needle
%
turn.
Hold
throttle lever
in idle position.
Turn " Idle Adjusting
Need le" forward
or
bock
~u
turn
at a
time until
e
ngine runs
smoothly.
Allow several
seconds between each adjust·
ment
for engine carburetor
to
react to
t
he
new
setling.
5
IDLE
ADJUSTING NEEDLE
Close
FI
NGER
TIGHT
only
and
then
re'open
two and one-half
turns.
FUEL
DRAIN PLUG
[iJ
HIGH
SPEED ADJUSTING NEEDLE
Close FINGER TIGHT only and then
re·open
one and one-half
turn
s.
FI
GURE 3
CAUTION: Never attempt to change
maxi-
mum engine
s
peed
.
This
is preset at fac
-
tory and can only be changed
by
a qual
i-
fi ed
Se
rv
ice re
pairman who has the
neces-
sary
equipment.
CHECK SPARK PLUG
Remove
t
he
spark
plug
each
time you
change oi
l
and
inspec
t
it.
a.
The
electrodes should
be kep
t
dean
and
free
of corban.
The
presence of
carbon or excess
oil will
greatly deter
proper engine performance.
b.
If possible,
check the
spark plug gop
(area
between
electrodes) using
a wire
feeler
gouge.
This
specification should
be
.030.
I
f
you
need a new
Spark
Plug refer to
the
ports
list fo
r
the proper replacement
Spark
Plug.
Before installing Spark Plug coot threads
ligh
tl
y with Graphi te Grease if possib le to
insu re easy remova
l
next
t ime t
he Spa rk
Plug needs
inspecti on
.

Advertisement

loading

  Related Manuals for Craftsman 143.629012