Service And Adjustments; Carburetor Adjustment; Adjusting Procedure; Initial Settings - Craftsman 358.794550 Instruction Manual

We recommend att service and adjust-
ments not listed in this manual be per-
formed by your Sears Service Center,
CARBURETOR ADJUSTMENT
Carburetor adjustment is critical and if
done improperly can permanently
damage the engine as welt as the car-
buretor, if you require further assis-
tance or are unsure about performing
this procedure, calt our customer as-
sistance help line at 1-800-235-5878.
Old fuel, a dirty air filter, a dirty fuel fil-
ter, or flooding may give the impres-
sion of an improperly adjusted carbu-
retor. Check these conditions before
adjusting the carburetor.
The carburetor has been carefully set
at the factory, Adjustments may be
necessary if you notice any of the fol-
lowing conditions:
• Engine wiit not idle. See LOW SPEED
MIXTURE ADJUSTMENT (L) under ad-
justing procedure,
• Engine dies or hesitates instead of ac-
celerating. See ACCELERATION CHECK
under adjusting procedure,
• Loss of power. See MIXTURE ADJUST-
MENT (L or H) under adjusting proce-
dure.
There are two adjustment screws on
the carburetor. The low speed adjust-
ment screw is marked with the letter L,
and the high speed adjustment screw
is marked with the letter H. The throttle
lever is used to control engine speed.
The throttle lever can be placed in one
offour positions: STOP, iDLE or _,
FULLTHROTFLE or _, and one inter-
mittent position.
Primer Button
Throttle Lever
,/.4 _ _-_Adjustment "H"
Adjustment 'U'
ADJUSTING PROCEDURE
CAUTION: Do not force plastic limiter
caps on screws beyond the built-in
stops or damage witi occur.
Initial Setting8
1. Turn both mixture screws (L and H)
counterclockwise until they stop.
2. Start engine, let it run for 3 minutes,
then proceed to adjust screws ac-
cording to the instructions below. If
engine performance at initiat settings
is acceptable, no further adjustments
are necessary, tf engine does not
start, refer to TROUBLESHOOTING
TABLE. If still unable to remedy situ-
ation, cali 1-800-235-5878.
Low Speed Mixture Adjustment - L
1. Allow the engine to idle.
2. Turn Iow speed mixture screw (L)
slowly clockwise until the speed be-
gins to drop,
3, Turn the low speed mixture screw
(L) counterclockwise until the speed
increases and then starts to drop
again.
4. Set the low speed mixture screw (L)
at the midpoint between the two
positions.
High Speed Mixture Adjustment - H
CAUTION: Adjust the mixture screw
1/16 of a turn at a time. A 1/16 turn is
about the width of the slot in the top of
the screw.
1. Run engine at futl throttle.
2. Turn the high speed mixture screw
(H) counterclockwise until it stops.
3. Turn the high speed mixture screw
(H) 1/18 of a turn clockwise at a time
untit the engine runs smoothly.After
completing adjustments, check for
acceleration. Reset if necessary.
Acceleration Check
If engine dies or hesitates instead of
accelerating, turn the Iow speed mix-
ture screw (L) counterclockwise until
you have smooth acceleration.
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