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CARBURETOR ADJUSTMENT
Engine Break-In
New engines must be operated a minimum duration of two tanks
of fuel break-in before carburetor adjustments can be made. Dur-
ing the break-in period your engine performance will increase and
exhaust emissions will stabilize. Idle speed can be adjusted as
required.
High Altitude Operation
This engine has been factory adjusted to maintain satisfactory
starting, emission, and durability performance up to 1,100 feet
above sea level (ASL) (96.0 kPa). To maintain proper engine op-
eration and emission compliance above 1,100 feet ASL the car-
buretor 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 en-
gine below 1,100 feet ASL, otherwise severe engine damage
may result.
BEFORE MAKING ADJUSTMENTS:
• The correct spark plug must be clean and properly gapped.
• The air lter element must be clean and properly installed.
• The mufer spark arrestor screen and exhaust port must be
clear of carbon.
• The standard bar and chain combination must be installed to the
power head, and properly tensioned.
WARNING
When carburetor adjustment is completed, the saw chain
should not move at idle, otherwise serious personal injury may
result.
LOW ALTITUDE ADJUSTMENT
1. Start engine and run for several minutes to reach operating
temperature.
2. Stop engine.
3. Start engine and turn the high-speed needle (A) rich (CCW)
until the engine runs between 13,500 and 14,500 RPM. Then
turn the low-speed needle (B) rich (CCW) until the engine does
not hesitate when accelerated.
DO NOT REMOVE LIMITER CAPS!
4. Idle Speed Adjustment.
• Turn “idle” speed adjustment screw (C) CW until the saw chain
begins to move, then turn the screw CCW until saw chain stops
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
stops or stalls after full warm up return the unit to your autho-
rized ECHO dealer for adjustment.
A
B
C
lo hi
A
B