Echo CS-361P, Instruction Manual

25

CS-361P

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 prevent settings outside acceptable 
limits. 

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 

operating 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 between 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 turn, 
then turn screw out CCW until the saw chain 
stops turning.  
Turn screw out, CCW, an additional ¼ turn. 

   WARNING

Cutting attachment must not move when unit 
is idling. 

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 3200 r/min. 

   CAUTION

When starting, idling adjustment speed 
should be adjusted not to rotate the saw 
chain.  
Correct idle speed is adjusted 3200 r/min.  
Or ¼ 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)

High Altitude Operation

This engine has been factory adjusted to maintain 
satisfactory starting, emission, and durability 
performance up to 1100 feet above sea level (ASL) 
(96.0 kPa).  
To maintain proper engine operation and emission 
compliance above 1100 feet ASL the carburetor 
may need to be adjusted by an authorized ECHO 
service dealer. 

IMPORTANT

If the engine is adjusted for operation above 
1100 feet ASL, the carburetor must be 
readjusted when operating the engine below 
1100 feet ASL, otherwise severe engine damage 
may result.