Carburetor Adjustment Emission - Echo SHC-1700 - Type 1, SHC-1700 - Type 1E, SHC-2100 - Type 1, SHC-2100 - Type 1E, SHC-2400 - Type 1, SHC-2400 - Type 1E, HCA-2400 - Operator's Manual

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3. Use the wooden stick or brush to remove dirt from the cylinder
fins.
4. Remove grass and leaves from the grid between the recoil starter
and fuel tank.
5. When installing the engine cover, be certain the tab of the metal
deflector shield is in the slot of the cover.
CARBURETOR ADJUSTMENT
Type 1E Models
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
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 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.
SHC-1700, 2100 TYPE 1E
A
C
A
C
SHC-2400
HCA-2400
TYPE 1E
TYPE 1E
B
B