GRASS TRIMMER/BRUSH CUTTER
OPERATOR'S MANUAL
23
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. During 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 mean sea level
(MSL) (96.0 kPa and below). To maintain proper engine operation and
emission compliance above 1,100 feet MSL 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 MSL, the
carburetor must be re-adjusted when operating the engine below
1,100 feet MSL, otherwise severe engine damage can result.
Level 2.
Tools Required: Screwdriver, Tachometer (ECHO P/N
99051130017).
Parts Required: None.
NOTE
Every unit is run at the factory and the carburetor is set in compli-
ance with Emission Regulations. This carburetor does not have
acceleration and high speed adjustment needles.
1. Check idle speed and reset if necessary. If a tachometer is
available, idle speed screw (A) should be set to the specifications
found on page 28 "Specifications" of this manual. Turn idle screw
(A) clockwise to increase idle speed; counter clockwise to
decrease idle speed.
WARNING
When carburetor adjustment is completed, the cutting attachment
should not move at idle, otherwise serious personal injury may
result.
A
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