Poulan 1600 - Manual (Page 16)

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CARBURETOR ADJUSTMENTS
^WARNING
Make carburetor adjustments with the driveshaft hous­
ing supported to prevent the trimmer line from contact-
ingany object, Holdthetoolwithyour hand, Donotuse
the optional shoulder strap for support.
A warning
Keep others away when making carburetor
adjustments.
A warning
Serious injury to the operator and others can occur if the
carburetor is not properly adjusted.
• The carburetor has been carefully adjusted at the
factory. However, the operator must be sure that
adjustments are made when any of the following
conditions occur;
NOTE: Be sure to properly prepare the tool as
described in “1. Preparation” before making any
adjustments.
— Engine will not continue to run at idle position. See
"2. Idle Speed Adjustment” and “5. Low' Speed Mix­
ture Adjustment.”
— Trimmer Head continues to spin when the engine
idles. See ‘^2, Idle Speed Adjustment” and * *‘4.
Deceleration Check,”
— Engine dies or hesitates w hen it should accelerate.
See “3. Acceleration Check.”
— Loss of cutting power which cannot be corrected by
cleaning the air filter. See “6. High Speed Mixture
Adjustment,”
— Engine does not return to idle from full throttle
within 2 seconds. See *‘4. Deceleration Check,”
— Engine will not run. See “Trouble Shooting Chart,”
Then, if the carburetor requires adjustment, begin
with “7. Basic Carburetor Settings.”
• This is a complicated task and it is important to
follow instructions in sequence as indicated.
• Very small adjustments can affect engine perfor­
mance, It is important to turn the screw a very small
amount per adjustment and test performance before
making further adjustments. Each adjustment should
be no more than the width of the slot in the adjusting
screws-
A warneng
The trimmer line will be spinning during most of this
procedure. Wear your protective equipment and observe
all safety instructions.
1. PREPARATION
a. Use a fresh fuel mix. See “Fueling libur Engine.”
b. Make sure the line extends to the length allowed by
the line limiter to provide correct load on engine.
c. Start the engine. Cut grass for 3 minutes to warm
engine. The engine ?mist be at operating tenperature
before carburetor adjustmments can be performed
correctly,
d. Stopengineandremoveairfilterbypullingitoutwith
your fingers. Refer to “Specifications” for location.
2.. IDLE SPEED ADJUSTMENT
a. Allow engine to idle.
b. Adjust Idle Speed Screw (Figure 23) until the engine
continues to run without stalling and without the
trimmer head moving.
— Turn screw clockwise Ю increase engine
speed if the engine stalls or dies.
— Turn screw counterclockwise to slow
engine down and/or to keep the trimmer line from
turning.
c. Follow instructions in “3. Acceleration Check” and
“4, Deceleration Check.”
d. No further adjustments are necessary' if the trim­
mer head does not turn at idle speed and if per­
formance is satisfactorv.
A warning
Recheck idle speed after each adjustment- The trimmer
headmustnot turn at idle speed to avoid serious injury
to the operator and others,
3. ACCELERATION CHECK
a. Allow engine to idle.
b. Squeeze Trigger fully.
1. ) If performance is satisfactory, proceed to “4.
Deceleration Check.”
2. ) If the engine does not accelerate smoothly,
turn the Low Speed Mixture Screw (Figure 23)
counterclockwise A a small amount (no
more than the width of the slot in the adjusting
screw).
c. Repeat steps “b.” until smooth acceleration is
obtained.
NOTE: It may be necessary to repeat “2. Idle Speed
Adjustment” through “3. Acceleration Check ” to
obtain correct adjustments.
d. Follow instructions in “4. Deceleration Check.”
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