Carburetoradjustments - Husqvarna 23 Compact Operator's Manual

D. CARBURETOR ADJUSTMENTS
Poor engine performance can be a result of
other causes such as dirty air filter, carbon
build-up on muffler outlets, etc. See the
"Trouble Shooting Chart" before proceed-
ing with carburetor a~ustments.
For best results, HUSQVARNA recommends
that you have a qualified service dealer
make all carburetor adjustments. Yourdeal-
er has the training,experience, and toolsneces-
saryto properly adjustyousawto meetourfacto-
ry performance s pecifications. This service is not
covered by warranty. If it becomes necess
7
for
you to make carburetor adjustments yoursel , fol-
low the described procedures very carefully.
The carburetor has been a~usted at the fac-
tory for sea level conditions. Adjustments
ma~become necessary if the saw is used-atsignifi-
cantly higher altitudes or if you notice any of the
following conditions:
NQTIIGBe sure to properly prepare the saw as de-
scribed in "l. Prepsration' (below) before mak-
ing any adjustments.
– Chain moves when the engine runs at idle
speed. See "2. Idle Speed Adjustment. "
– Saw will not idle, See "2. Idle Speed Adjust-
ment" and "3. Low Speed Mixture Adjust-
merit."
– Engine dies or hesitates when it should accel-
erate. See "4. Acceleration Adjustment. "
— Loss of cutting power which is not corrected by
air filter cleaning. See "5. High SpeedMixture
Adjustment. "
ICAUTIO N: I Permanent damage will occur to
any 2-cycle engine if incorrect carburetor
a~ustments are made.
" :2L;::;2;&Y:t;:;i:;:&:"t\:r:zs:e:
qualified service dealer.
A
WARNING
The chain will be moving during most of this
procedure. Wear your protective gear and ob-
serve all safety precautions.
o
N: I The air filter cover must be re-
1.
moved before making carburetor adjust-
ments. Before reinstallingthe air filter cov-
er, the air filter must be cleaned or engine
performance will be affected.
PREPARATION
a.
b.
c.
d.
e.
f.
Stop the engine.
Use a fresh fuel mixture with proper gasoline/
oil ratio.
Place the saw on a solid, flat surface and make
sure the chain will not contact any object.
Remove air filter cover and clean the air filter.
Locate the three (3) carburetor adjusting
screw openings to the right of the air filter cov-
er. Figure 42.
Start the engine and allow engine to idle three
(3) minutes to warmup. The engzne must beat
operating temperature for proper adjustments
to be made.
Choke
High Speed
Closed+
Mixture
b_/
,\
Screw
r
%
\\
K. ,
It ~
Low Speed
) ~
Mixture
Figure 42
2. IDLE SPEED ADJUSTMENT
a. Allow the engine to idle.
b. Adjust the idle speed screw until the engine
continues to run without stalling and without
the chain moving.
– Turn screw clockwise to increase engine
speed if engine stalls or dies.
– Turn screw counterclockwise to slow engine
down andlor to keep the chain from turning.
c. No further adjustments are necessary if
the chain does not move at idle speed and
if performance is satisfactory.
A
WARNING
In "3. Low Speed Mixture Adjustment," recheck
idle speed after each adjustment. The chain
must not move at idle speed and if performance
is satisfactory.
I
3. LOW SPEED MIXTURE ADJUSTMENT
4.
a. Allow engine to idle.
b. Turn the low speed mixture screw slowly
clockwise until the RPM starts to drop. Note
the position.
c. Turn the low speed mixture screw slowly coun-
terclockwise until the RPM speeds up and
starts to drop again. Note the position.
d. Set the low speed mixture screw at the mid-
point between the two positions.
ACCELERATION ADJUSTMENT
If the engine dies or hesitates instead of accelerat-
ing, turn the low speed mixture screw 1/16 of a
turn at a time counterclockwise until you have
smooth acceleration.
HIGH SPEED MIXTURE ADJUSTMENT
5. ----
TIO N: I Adjustments as small as 1/16 of a
turn can a-ff~ct-engine performance. It is
important to turn the screw only 1/16 of a
turn per adjustment and test the perform-
ance of the saw before making further ad-
justments.
a. Makea testcut.
b. Adjustthe highspeedmixturescrew1/16 ofa
turnas follows:
– Clockwise if sawsmokesor losespower.
– Counterclockwise if the sawhas speedout
of the cutbut lackspowerin thecut.
c. Repeattestcut.
d. Continue1/16 of a turnadjustments untilthe
sawrunssmoothly in cut.
A too lean high speed setting
(clockwise adjustment) will cause engine
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