Carburetor Adjustments - Craftsman 358.351191 Operator's Manual

SERVICE AND ADJUSTMENTS
CARBURETOR PRESETS (Fig. 59)
CARBURETOR ADJUSTMENTS
Carburetor adjustment is critical and if done improp-
erly can permanently damage the engine as welt as
the carburetor, Please read all instructions and con-
sult the Troubleshooting section of this manual
before beginning this process, If the engine does not
operate according to these instructions after repeat-
ing the adjusting steps, do not use the unit. For fur-
ther assistance, please call our customer assistance
hottine at 1-800-235-5878,
WARNING:
THE CHAIN WILL BE MOVING DURING
MOST OF THIS PROCEDURE. WEAR
YOUR PROTECTIVE EQUIPMENT AND
OBSERVE ALL SAFETY PRECAUTIONS,
IN "LOW SPEED MIXTURE ADJUST-
MENT;' RECHECK IDLE SPEED AFTER
EACH ADJUSTMENT. THE CHAIN MUST
NOT MOVE AT IDLE SPEED.
If engine does not start, it may be flooded If in doubt,
read the section on flooded engine in the starting section
of this manual prior to beginning any adjustments.
The carburetor has been adjusted at the lactory for sea
level conditions. Adjustments may become necessary if
the saw is used at significantly higher altitudes or if you
notice any of the following conditions:
. Chain moves when the engine runs at idle speed. See
"Idle Speed Adjustment!'
o Saw will not idle. See "Idle Speed Adjustment" and "Low
Speed Mixture Adjustment_'
• Engine dies or hesitates when it should accelerateSee
"Acceleration Adjustment."
° Loss of cutting power which is not corrected by air filter
cleaning.. See "High Speed Mixture Adjustment.,'
NOTE: There are three adjustments on the carburetor.
• The Idle Speed Adjustment is marked with the letter
• The two remaining adjustments on the carburetor are
the mixture adjustments. One is marked "L:' for low
speed, and the other"H" for high speed
If your engine will not start due to suspected improper
carburetor adjustment, the following presets may be re-
quired If used, it is recommended that all steps within the
adjustment procedure be completed in order to assure a
properly set carburetor, if presets are not needed, pro-
ceed to section "Idle Speed Adjustment"
Very small adjustments can affect engine performance. It
is important to make slight adjustments and test perfor-
mance before proceeding. Each adjustment should be no
more than 1/16 of a turn.
• Turn both of the mixture adjustments clockwise until
they stop Do not overtighten as damage to the needle
seats will occur
• Turn both mixture adjustments counterclockwise one
full turn,
° Turn the idle speed adjustment clockwise until it
stops. Now turn counterclockwise 4-1/2 turns
- if engine fails to start after performing carburetor pre-
sets, the unit may be floode& Review the "Difficult
Starting" section of the manual, if problems continue
call the 1_800 number listed on the front cover of this
manual for further assistance
• Start the engine and operate for three (3) minutes to
warm up Go to "Adjusting Procedure,
idle Speed Adjustment
\\ / /\ Mixture l _'_H,_ }
\__i_Adjustment "_l_..,._
_/ i _l_ -'-_._..__ HighSpeed
_i __ _' _-"_ .Mixture
_ _ (._ Adjustment
Figure 59
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