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carburetor adjustment
Engine Break-In
New engines must be operated a minimum duration of two tanks of fuel
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 operation and emission compliance 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
BEFORE MAKING ADJUSTMENTS:
•The correct spark plug must be clean and properly gapped.
•The air filter element must be clean and properly installed.
•The muffler spark arrestor screen and exhaust port must be clear of carbon.
•The standard bar and chain combination (see page 4) 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
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
C
A
B
lo hi
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