Echo CS-352 - Manual (Page 25)

25 CS-352
1. Before adjusting carburetor clean or replace air filter
and muffler “Spark Arrestor Screen”.
2. Make sure the bar and chain are properly adjusted.
3. Start engine and run several minutes to bring to oper-
ating temperature. Flash choke twice during warm-up
to clear any air from the fuel system.
4. Stop engine. Turn “H” speed needle counterclockwise
(CCW) to stop. Turn “L” speed needle midway be-
tween full clockwise (CW) stop and CCW stop.
5. Idle Speed Adjustment:
• Start engine, turn “Idle” speed adjustment screw
CW until the saw chain begins to move, then turn
screw out CCW until the saw chain stops moving.
Turn screw out, CCW, an additional 1/4 turn.
6. Accelerate to full throttle for 2 - 3 seconds to clear
any excess fuel in the engine, then return to idle.
Accelerate engine to full throttle to check for smooth
transition from idle to high speed. If engine hesitates
turn “L” needle CCW 1/8 turn and repeat acceleration.
Continue adjustment until smooth acceleration results.
7. Check idle speed and reset if necessary as described
in item 5. If a tachometer is available idle speed should
be set to 3000 r/min.
warning
Cutting attachment must not move when unit is idling.
CaUTiOn
When starting, idling adjustment speed should be
adjusted to prevent the saw chain from moving.
Correct idle speed is adjusted 3000 r/min. Or 1/4 turn
CCW from the point the chain stops moving.
When you experience trouble with the carburetor,
contact your dealer.
Idle adjusting screw
Low speed needle (L)
High speed needle (H)
CarBUrETOr aDJUSTMEnT
Every unit is run at the factory and the carburetor is set
in compliance with Emission Regulations. In addition,
the carburetor is equipped with “H” (High Speed) and
“L” (Low Speed) needle adjustment limiters that pre-
vent settings outside acceptable limits.
Engine Break-in
New engines must be operated a minimum duration
of two tanks of fuel break-in before carburetor adjust-
ments can be made. During the break-in period your
engine performance will increase and exhaust emis-
sions will stabilize. Idle speed can be adjusted as
required.
High altitude Operation
This engine has been factory adjusted to maintain sat-
isfactory starting, emission, and durability performance
up to 1,100 feet above sea level (ASL) (96.0 kPa). To
maintain proper engine operation and emission compli-
ance above 1,100 feet ASL the carburetor may need to
be adjusted by an authorized ECHO service dealer.
iMPOrTanT
If the engine is adjusted for operation above
1,100 feet ASL, the carburetor must be re-
adjusted when operating the engine below 1,100
feet ASL, otherwise severe engine damage may
result.