Craftsman 358.798260-32cc - Manual (Page 22)

C. CjysmiMirroilAPJUSTMiacri
▲ warming _____
Make
caiiNiretora4justnieiits with the drive shaft hous*
ing supported to prevent the Blade or trimmer line
from contacting any object.Hold the tool with yourhandi
do not use theoptional shoulder strap for support.
▲ warning
Keep others away when making carburetor
adjustments.
▲ warning
Serious Injury to the operaUir and others can occur if the
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 “TVouble Shooting
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 “Trijuble Shooting Sugges­
tions” below.
• 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 ihe slot in the adjusting
screws.
• This is a complicated task. It Is important to follow
Instructions in sequence as indicated.
1. mOUBLE SHOOTING SUGGOTIONS
— Engine will not continue to run at idle position.
See “b.” Idle Speed Adjustment” and “e. Low
Speed Mixture Adjustment.”
— Blade or Trimmer Head continues to spin when
the engine idles. See “b. Idle Speed Adjustment”
and “d. Deceleration Check.”
— Engine dies or hesitates when it should accelerate.
See “c. Acceleration Check.”
— loss of cutting power which cannot be corrected
by cleaning the air filter. See “f. High Speed Mix­
ture Adjustment.”
— Engine does not return to idle from full throttle
within 2 seconds. See ‘‘d. Deceleration Check.”
— Engine will not run. See “TVouble Shooting
Chart.” Then, if the carburetor requires adjust­
ment, begin with“2. Basic Carburetor Settuip.”
▲ warning .....
The Blade or trimmer line will be spinning during
most of this procedure. Wearyour protective equipment
and observe all safety instructions. ___________________
22
l.BA81CCAIUItmif01ttETnN0S
NOTE; In most cases, your engine can be made to
ran properly with minor carburetor adjustments.
Refer to “Trouble Shooting Suggestions” in the left
column for the condition you are experiencing and
- “ follow the instructions. The basic carburetor settings
are provided in the event they are required.
a. Turn the Low Speed Mixture Screw and the High
Speed Mixture Screw clockwise 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 countercloclwise.
c. Follow instructions “a. Preparation,” through “f. !
High Speed Mixture Adjustment.”
3.PROCEDUR£
a. PREPARATION
1. jUsea fresh fuel mix. See “FuelingTtburEngine."
2. )Mal« sure line extends to the length allowed by line
limiter to provide correct load on engine.
3. jStart the engine. Cut grass for 3 minutes to warm
engine. The engine must be at operating temper­
ature before carburetor adjustments can be per~
formed correctly.
4. )Stop engine and remove air filter pulling it out
with your fingers. Refer to “Specifications” for
location.
tx IDLE SPEED ADJUSTMENT
1. jAllow engine to idle.
2. )Adjust Idle Speed Screw until the engine
continues to run without stalling and___________
without the trimmer head moving.
—^ Turn screw clochme to increase engine speed
if the engine stalls or dies.
— Turn screw counterclockwise to slow engine
dorni and/or to keep blade or trimmer head
from turning.
3. )FoIIowinstructionsin ”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.
¿W arning
Recheck idle speed after each adjustment. The blade or
trimmer head must not turn at idle speed to avoid serious
injury to the operator and others. ___________________
«.ACCELERATION CHECK
1. jAllow engine to idle. ^
2. }Squeeze Trigger fully
a. If performance Issatisfactory, proceed to “d.
Deceleration Check."
b. Ifthe engine does not accelerate smoothly,
turn the Low Speed Mixture Screw counter-
clockwise a small amount (no morei than the
widthofthesiot intheadjustingserew).
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'.)FoIlow instructions in “d. Deceleration Check ."