Poulan 1600 - Manual (Page 17)

4.1>ECEjUE;RAT10N CHECK
a. Allow engine to idle, then squeeze Throttle Trigger
fully.
b. Allow engine to mn at full speed for about 1 second.
c. Release the Throttle Trigger to the idle position and
listen to the deceleration of the engine. It must return
to idle smoothly and within 1 to 2 seconds.
1. )K performance is satisfactory’, proceed to step
“d.”
2. )If the engine slowly or erratically returns to
idle or idles erratically, repeat “2. Idle Speed
Adjustment” or continue through Low Speed
Mixture and High Speed Mixture Adjustments to
obtain proper deceleration.
d- Recheck idle speed.
5. LOW SPEED MIXTURE ADJUSTMENT
a. Allow engine to idle.
b. Turn the Low Speed Mixture Screw (Figure 23)
slowly clockwise ^ k until the speed starts to
drop. Note this position.
c. Turn the Low Speed Mixture Screw counterclock­
wise until the speed increases and then starts
to drop again. Note this position.
d. Set the Low Speed Mixture Screw at the mid-point
between the two positions.
e. Follow instructions in “3. Acceleration Check” and
“4. Deceleration Check,”
6. HIGH SPEED MIXTURE ADJUSTMENT
fCAUTlQ]^ Do not operate engine at full
throttle for prolonged periods while making high
speed adjustments as damage to the engine can
occur.
a. Support the drive shaft housing so the trimmer line
is off the ground and wiU not make contact with any
object.
b. Allow engine to idle, then squeeze Throttle Trigger
Mly.
NOTE: Perform steps “c.” through “e.”, at full
throttle.
c. Turn High Speed Mixture Screw (Figure 23) very
slowly clockwise ^ until engine speed is
reduced.
d. I\xm High Speed Mixture Screw very slowly
counterclockwise 4^^ .Stop when the engine just
begins to run rough.
e. Turn the screw slowly the nunimuin amount clock­
wise until the engine runs smoothly.
f. Follow instructions in “3. Acceleration Check” and
“4. Deceleration Check.”
I CAUTION: I If the engine does not operate
according to these instructions after repeating the
adjusting steps, do not use the tool- Take it to a
qualified service dealer,
7. BAS1C CARBURETOR SETTINGS
a. Turn the Low Speed Mixture Screw and the High
Speed Mixture Screw (Figure 23) clockwise A
just until they stop. Do not turn the screws until they
are tight as damage to the needle seats can occur.
b. Turn the Low Speed Mixture and High Speed Mix­
ture Screws one full turn counterclockwise 4—^ .
c. Follow instructions “1. Preparation,” through “6.
High Speed Mixture Adjustment.”
8. RE1NSTALL AIR FILTER
Be sure filter is clean. See “Air Filter” for instmctions.
CAUTION: Fit air filter into the corners of the
housing to keep dirt from entering the engine and
causing engine damage.
0. AIR FILTER
A dirty air filter decreases the life and performance of the
engine and increases fuel consumption.
Clean the Air Filter:
• Always after 5 tanks of fiiel or 5 hours of operation,
whichever is less.
• More frequently, in dusty conditions,
1. Pull the Air Filter from the engine with you fingers. For
Air Filter location, see “Specifications.”
2. Wash in soap and water.
ICAUTIO n T] Do not clean the air filter in
gasoline or other flammable solvent to avoid
creating a fire hazard.
3. Squeeze dry and replace.
1 CAUTION: i The air filter must be fitted into
the corners of the housing to avoid engine damage.
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