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CARBURETOR ADJUSTMENT
Non Emission Models (without limiter caps)
Tools required: Screwdriver, Tachometer (ECHO P/N 99051130017).
NOTE
If carburetor has limiter caps follow "Carburetor Adjustment" procedures for Emission models on previous page.
Idle Speed Adjustment
Turn "idle" speed adjustment screw (C) CW (clockwise) until blades
begin to move, then turn screw out CCW (counter clockwise) until
blades stop moving. Turn screw out, CCW an additional 1/4 turn.
WARNING
Blades must not move when unit is idling, otherwise serious
personal injury may result.
Basic Setting
1.
Stop engine and turn both LO (B) and HI (A) needles in, CW until
they stop and are lightly seated.
IMPORTANT
DO NOT over tighten needles. Forcing them to tighten will damage
the carburetor.
2.
Turn LO needle (B) out, CCW 1-1/4 turns. Turn HI needle (A) out
CCW 2-3/4 turns.
Fine Tuning
(Requires Accurate Tachometer ECHO P/N 99051130017)
1.
Start engine and allow to warm to operating temperature (minimum
2 - 3 minutes) varying engine speed from idle to full throttle.
2.
Always begin fine tuning with LO needle (B).
a. Lean drop-off - With engine idling, turn LO needle (B) slowly
CW (in) to lean drop-off point. RPM will increase, then abruptly
drop-off. (1) Note this position.
b. Rich drop-off - With engine idling, slowly turn LO needle (B)
CCW (out) to rich drop-off point. RPM will increase then
gradually slow and drop-off. (2) Note this position.
c. Final setting - Set needle at mid point between lean rich drop-off
points. (3)
d. Turn 1/8 turn CCW (out) making mixture slightly richer. (4)
3.
High speed adjustment.
Adjust HI needle (A) with tachometer to achieve the specifications
found on page 14 "Specifications" of this manual.
4.
Check idle speed and reset if necessary. Using a tachometer, idle
speed should be set to the specification found on page 14 "Specifi-
cations" of this manual.
WARNING
When carburetor adjustment is completed blades should not move
at idle, otherwise serious personal injury may result.
DANGER
DANGER
H
C
EDGE
O
'
M
PERATOR
S
SHC-1700, 2100 TYPE 1
A
C
A
C
SHC-2400
TYPE 1
(3)
(4)
(2)
LIPPER
29
ANUAL
B
HCA-2400
TYPE 1
(1)
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