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CARBURETOR ADJUSTMENT
Level 2.
Tools required: Screwdriver, Tachometer (ECHO P/N 99051130017).
Parts required: None.
NOTE
Every unit is run at the factory and the carburetor is set in compli-
ance with EPA Phase 1 and California Emission Regulations. In
addition, the carburetor is equipped with HI and LO needle adjust-
ment 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 speed needle (A) CCW (counter clockwise) to
stop. Turn LO speed needle (B) midway between full CCW and CW
(clockwise) stops.
4.
Idle Speed Adjustment.
• Start engine and turn "idle" speed adjustment screw (C) CW until
the blades begin to move, then turn the screw CCW until blades
stop moving. 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 needle (B) CCW an additional 1/8 turn and repeat acceleration.
Continue adjusting until smooth acceleration results.
6.
Check HI speed RPM at W.O.T. (Wide Open Throttle). HI speed
RPM should be set to specifications found on page 12 "Specifica-
tions" of this manual.
7.
Check idle speed and reset if necessary. If a tachometer is available,
idle speed should be set to the specification found on page 12
"Specifications" of this manual.
WARNING
When carburetor adjustment is completed, blades should not move
at idle, otherwise serious personal injury may result.
IMPORTANT HIGH ALTITUDE INSTRUCTIONS
In areas over 1219 m (4000 ft.) the engine may run rough (rich
operation) with low power. Adjust HI speed needle 1/8 to 1/4 turn
clockwise until engine runs smooth at full throttle. Below 1219 m
(4000 ft.) adjust HI speed needle 1/8 to 1/4 turn counter-clockwise
until engine runs smooth at full throttle.
DANGER
S
H
C
HAFT
EDGE
O
'
M
PERATOR
S
LIPPER
23
ANUAL
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