Echo CS-500P Instruction Manual - page 26

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CS-500P

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 high speed

and 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. 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 1/4 turn.

   WARNING

Cutting attachment must not move when unit

is idling.

5. 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.

6. Check idle speed and reset if necessary as

described in item 4. If a tachometer is available

idle speed should be set to 2800 r/min.

   CAUTION

When starting, idling adjustment speed

should be adjusted not to rotate the saw

chain. Correct idle speed is adjusted 2800

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

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.