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24
CARBURETOR ADJUSTMENT
Emission Models
Level 2.
Parts required: None.
WARNING
Saw chain must not turn when unit is idling, otherwise serious
personal injury may result.
NOTE
Every unit is run at the factory and the carburetor is set in compliance with EPA Phase 1 and California Emission
Regulations. In addition, the carburetor is equipped with HI (A) and LO (B) needle adjustment limiters that prevent
settings outside acceptable limits.
1. Before adjusting the carburetor, clean or replace the air filter and
spark arrester screen.
2. Start engine and run for several minutes to reach operating
temperature.
3. Stop engine. Turn HI (A) speed needle CCW (counter clockwise)
to stop. Turn LO (B) speed needle midway between full CCW and
CW (clockwise) stops.
4. Idle Speed Adjustment.
-Start engine and turn idle (C) speed adjustment screw CW until
the saw chain begins to turn, then turn the screw CCW until saw
chain stops turning. Turn screw CCW an additional 1/4 turn.
5. Accelerate to full throttle for 2-3 seconds to clear excess fuel from
engine then return to idle. Accelerate to full throttle to check for
smooth transition from idle to full throttle. If engine hesitates, turn
LO (B) needle CCW an additional 1/8 turn and repeat accelera-
tion. Continue adjusting until smooth acceleration results.
6. Check HI (A) speed RPM at W.O.T. (Wide Open Throttle). HI
speed RPM should be set to specifications found on page 13
"Specifications" of this manual.
7. Check idle speed and reset if necessary. If a tachometer is avail-
able, idle speed should be set to the specification found on page
13 "Specifications" of this manual.
WARNING
When carburetor adjustment is completed, saw chain should not
move at idle, otherwise serious personal injury may result.
DANGER
DANGER
A
C
PPSR-2122
A
C
PPSR-2433
B
B
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