14. CARBURETOR SPECIFICATIONS AND ADJUSTMENT PROCEDURES
A. WORK AREA MUST BE CLEAN AND FREE OF ANY LOOSE PARTICLES (CHIPS, FLOOR
SWEEP, ETC.) WHICH COULD BE DRAWN INTO THE ENGINE WHILE RUNNING.
B. ENGINE MUST BE FULLY EQUIPPED WITH AIR FILTER COVER IN PLACE.
C. CONDITIONS
1) USE CLEAN, FRESH 40:1 FUEL MIX.
A) USE REGULAR UNLEADED GASOLINE
B) USE POULAN 40:1 OIL
D. START ENGINE AND ALLOW TO WARM UP BETWEEN 2-3 MINUTES
E. FINAL ADJUSTMENT
1) WITH ENGINE STARTED, RUN AT LEAST FIVE (5) SECONDS AT WIDE OPEN
THROTTLE (W.O.T.) BEFORE BEGINNING THE FOLLOWING ADJUSTMENT
SEQUENCE, AT 16" LINE LOAD.
a) WITH ENGINE STILL AT W.O.T., ADJUST SCREW SLOWLY, CLOCKWISE
(LEAN) UNTIL ENGINE JUST BREAKS INTO A CLEAN 2-CYCLE.
b) ADJUST MIXTURE SCREW SLOWLY, COUNTERCLOCKWISE (RICH) UNTIL
ENGINE OCCASIONALLY 4-CYCLES.
c) ADJUST MIXTURE SCREW ONLY A SLIGHT AMOUNT IN THE CLOCKWISE
(LEAN) DIRECTION TO PRODUCE A JUST CLEAN 2-CYCLE MODE
(OCCASIONAL 4-CYCLING PERMITTED).
NOTE: DUE TO FUEL PUDDLING EFFECTS OF A 2-CYCLE ENGINE, THE
ENGINE MUST BE FULLY WARMED-UP BY THE TIME STEP c) IS
COMPLETED. ADJUST IDLE SPEED IN THE FOLLOWING STEP
AND CHECK W.O.T. PERFORMANCE AFTERWARDS.
d) ADJUST IDLE SPEED TO SPECIFICATIONS (3400 - 4000 RPM),
NOTING THAT THE SPEED WILL DROP FROM THE ORIGINAL SETTING AS
THE FUEL PUDDLE BEGINS TO FORM IN THE CRANKCASE. COMPENSATE
FOR THIS DROP BY SETTING TOWARD THE TOP OF THE SPEC (CLOSE
TO 4000) AFTER THE ENGINE FIRST RETURNS TO IDLE.
e) CHECK W.O.T. PERFORMANCE (ACCELERATION AND TOP RPM
CONDITION).
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