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L)Allowengine to idle.
2. )Squeeze Trigger fully
a_ If wxformam'e is satisfactory, proceed to "d.
Deceleration Check."
b. Ifthe engine does not accelerate smootldy,
turn the low Speed Mixture Screw (Figure 35)
counterclockwise _ a small amount (no
more than the width ofthe slot in the adjusting
screw),
3 )Repeat step "2)'" until smooth acceleration is
obtained
NOTE: It may be necessary to repeat "b. Idle
Speed Adjustment" through "c,, Acceleration
Check," to obtain correct adjustments
4 )Follow instructions in "d Deceleration Check,"
d. DECE]L,EKATION CHECK
l.)Allow engine to idle, then squeeze Throttle Trig-
ger fully
2.)Allow engine to run at full speed for about 1
second
3_)Release the Throttle Trigger to the idle position
and listen to the deceleration of the engine It must
return to idle smoothly and within I to 2seconds
a If performance is satisfactory, proceed to
step "4.)"
b, Ifthe engine slowly or erratically returus to
idle or idles erratically, repeat"b, Idle Speed
Adjustment" or continue through Low Speed
Mixture and High Speed Mixture Adjustments
to obtain proper deceleration
4.)Recheck idle speed
HIGHSPEEDMIXTURE
ADJUSTMENTSCREW LOWSPEED MIXTURE
ADJUSTMENTSCREW
IDLE SPEED AIR
ADJUS'I'MFJqT FILTER
SCREW COVER
k"tg,_re 35
L)Allow engine to idle
2.)Turn the Low Speed Mixture Screw (Figure 35)
slowly clockwise until the speed starts to drop_
Note this position.
30Turn the Low Speed Mixture Screw counter'-
clockwise until the speed increases and then starts
to drop again Note this position.
4.)Set the Low Speed Mixture Screw at the m_id-
point between the two positions,
5,) Follow instructions in "c_ Acceleration Check"
and "d Deceleration Cheek"
L HIGH SPEED _XTURE AD_.Js'rbIENT
tCAUTIION:I Do not operate engine at full
throttle for prolonged periods while making high
speed adjustments as damage to the engine
can occur.
1 )Support the drive shaft housing so the trimmer
line is off the ground and wilt not make contact
with any object.
2 )Allow engine to idle, then squeeze Throttle Trig-
ger fully
NOTE: Perform steps "3.)" through "5).'
at full throttle
3 )Turn High Speed Mixture Screw (Figure 35) very
slowly clockwise until engine speed is reduced,
4 )Turn High Speed Mixture Screw very slowly
counterclockwise, Stop when the engine begins
to run roughly_
5,)Turn the screw slowly the minimum amount
clockwise until the engine runs smoothly,
6,,)Follow instructions in "c. Acceleration Check"
and "d, Deceleration Check"
[CAUTION: ] If the engine does not operate
according to these instructions alter repeating
the adjusting steps, do not use the tool. Take
it to your Sears Service Center.
g. REINST&LL AIR FILTE_
Be sure filter is clean_ See "Air Filter" in the
Maintenance Section for instructions.
[CAIYrION:'] Fit air filter into the corners of the
housing to keep dirt from entering the engine and
causing engine damage. Figure 28.
21
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