Carburetor Adjustment - Craftsman 143.629012 Owner's Manual

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 .