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o This is a complicated task. It is important to +bt-
low insturctions in sequence as indicated.
Aw o
Make carburetor addustmeats with the driveshaft hous-
ing supported to prevent trimmer line from contacting
any object. Hold the tool with your hand. Do not use the
optional shoulder strap for support.
N(YI_: In most cases, your _*ngine can be made to
run properly with minor ca_-buretor adjustments,
Refer to "Trouble Shooting Suggestions" for the
condition you are experiencing and follow the instruc-
tions° The basic carburetor settings are provided in
case they are _equired.
d_'_'AklR_E[_I@ a, 'iurn the Low Speed Mixture Screw and the High
Speed Mixture Screw (Figure 35) clockwise ,just
Keep others away when making carburetor adjust-
ments.
Aw_G
Serious ipjury to the operator and others can occur ifthe
carburetor is not properly adjusted.
® Poor engine performance can be a result of other
causes such as dirty air filter, carbon build-up
on muffler' outlets, etc. See "Trouble Shooting
0
Chart" before proceeding with carburetor
adjustments.
The carburetor has been carefully adjusted at the
factory. However, the operator must be sure that
adjustments are made when any of the conditions
occur as mentioned in "Trouble Shooting Sugges+
tions" below.
Very small adjustments can affect engine perfor-
mance. It is important to turn the screw a very smalt
amount per adjustment and test performance betbre
making furtheradjustments Each adjustment should
be no more than the width of the slot in the adjusting
screws
1. TROUB_._ $1I_G -_U_F.S_ONS
-- Engine will not continue to run at idle position.
See "b:' Idle Speed Adjustment" and "e. Low
until they stop Do not turn :he _erewa :mtil they are
tight a5 damage to the needle seats can occut_
Turn the low Speed Mixture and High Speed Mix-
ture Screws one full turn counterclockwise,
Follow instructions "a Preparation,' through "f
High Speed Mixture Adjustment"
3.PROCEDUKE
Speed Mixture Adjustment"
Trimmer Head continues to spin when the engine
idles. See "b° Idle Speed Adjustment" and "d+
Deceleration Check"
a. PP.EP&R.ATION
1.)Use a fresh fuel mix. See "Fueling Your Engine,'
2 )Make sure the line extends to the length allowed
by the line limiter to provide correct load on
engine
3 )Start the engine Cut grass for 3 minutes to warm
engine '/he engine must be at operating temper_
ature before carburetor'adjustments can be per-
formed cortectl)'
4, )Stop engine and remove air f'dterby pulling itout
with your fingers, Refer to "Specifications" for
location,
tX ]IDLE SPEED.A.II)JUST/_IENT
Engine diesor hesitates when itshould accelerate.
See "c. Acceleration Check?'
Loss of cutting power which cannot be corrected
by cleaning the air f'dter.See"f. High Speed Mix-
ture Adjustment:'
-- Engine does not return to idle from full throttle
within 2 seconds. See "el. Deceleration Check:'
--Engine will not run, _ "Trouble Shooting
Chart" Then, if the carburetor requires adjust-
ment, begin with"2. Basic Carburetor Settings"
,_WA_a_IItbIG
The trimmer line will be spinning during most of this
procedure. Wear your protective equipment and oltr_erve
all safety instructions.
20
1 )Allow engine to idle,
2 )Adjust Idle Speed Screw (Figure 35) until the
engine continues to run without stalling and
without the trimmer head moving+
-- Turn screw clockwise to htcrease engine speed
if the engine stalls' or dies°
-- Tttrttscrew counterclockwise to slow enghm
down and/or to keep trimmer head flora
turning°
3 )Follow instructions in "c Acceleration Check"
and "d, Deceleration Check?'
4 )No further adjustments are necessary if the
trimmer head does not turn at idle speed and
if performance is satisfactory.
_WAK_IqlNG
Recheck idle speed after each adjustment. The trimmer
head must not turn at idle speed to avoid serious injury
to the operator and others.
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