SERVICE AND ADJUSTMENTS
CARBURETOR ADJUSTMENTS
Carburetor adjustment is critical and If done Improperly
can permanently damage the engine as well as the car-
buretor. Please read all Instructions and consult the
Trouble Shooting section of this manual before begin-
ning this process.
If
the engine does not operate accord-
ing to these instructions after repeating the adjusting
steps, do not use the unit. For further assistance. please
call our customer assistance helpline at 1-800-235-5878.
.I'i..
WARNING
~
The impeller will be spinning during this proce-
dure. Wear your protective
equipment
and
observe all safety instructions.
Keep others away when making carburetor
adjustments.
The mixture setting is a highly critical adjustment.
If set incorrectly, permanent damage will occur to
the engine, Do not run engine at full throttle for
prolonged periods while making the mixture
adjustment.
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.
• Engine will not continue to run at idle position. See "Idle
Speed Adjustment" and "Mixture Adjustment."
• Engine dies or hesitates when it should accelerate. See
"Acceleration Check."
• Loss of power which cannot be corrected by cleaning air
filter. See "Mixture Adjustment."
NOTE - There are two adjustments on the carburetor.
• The Idle Speed Adjustment is marked "Idle".
• The Mixture Adjustment is marked "Mix".
CARBURETOR PRESETS (Fig. 26)
If your engine will not start due to suspected improper carbu-
retor adjustment, the following presets may be required. If
used, it is recommended that all steps within the adjustment
procedure be completed in order to assure a properly set car-
buretor. If presets are not needed, proceed to section "Idle
Speed Adjustment."
When making adjustments, be careful not to force the plastic
limiter caps beyond the stops or damage will occur.
Very small aqjustments can affect engine performance. It is
important to make slight ajustments and test performance
before proceeding. Each adjustment should be no more than
1/16th of a turn.
• Turn the mixture screw counterclockwise to the limiter stop.
• Turn idle speed screw clockwise
1/2
turn.
• If engine fails to start after performing carburetor presets,
the unit may be flooded. 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:'
)
, Mixture
I
I
--
Adjustment
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Figure 26
ADJUSTING PROCEDURE
IDLE SPEED ADJUSTMENT "IDLE"
• Allow engine to idle.
• Adjust the idle speed until the engine continues to run with-
out stalling.
- Turn screw clockwise to increase engine speed ..
- Turn screw counterclockwise to slow engine down.
• No further adjustments are necessary if engine idles and
performance is satisfactory.
MIXTURE ADJUSTMENT "MIX"
IMPORTANT - Do not operate engine at full throttle for
prolonged periods while making mixture adjustments as
damage to the engine can occur.
• Turn the mixture screw counterclockwise until it stops. If the
engine accelerates and runs smoothly, no further adjust-
ments are necessary. If not continue to next step.
• Turn the screw slowly the minimum amount clockwise until
the engine runs smoothly.
• If the engine accelerates and runs smoothly, no further
adjustments are necessary.
ACCELERATION CHECK
• If the engine dies or hesitates instead of accelerating, turn
the mixture screw the width of the slot in the adjusting
screw counterclockwise until you have smooth acceleration.
• Check the idle speed for stability. Adjust as necessary.
• Recheck for smooth acceleration and stable idle.
• Repeat process as necessary for acceptable performance,
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