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CARBURETOR ADJUSTMENT
Engine Break-In
New engines must be operated a minimum of two tanks of fuel 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 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 re-adjusted when operating the engine below
1100 feet ASL, otherwise severe engine damage may result.
Level 2.
Tools required:
Screwdriver, Tachometer (ECHO P/N 99051130017).
Parts required:
None.
1.
Before adjusting carburetor clean or replace air fi lter and muffl er,
"Spark Arrestor Screen".
2.
Make sure the cutting attachment such as hedge clipper blades
or circular saw are properly adjusted. Trimmer line should be
extended to cut-off knife.
3.
Start engine and run several minutes to bring to operating tempera-
ture. 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 clockwise
(CW) until the cutting attachment begins to turn, then turn screw
out counterclockwise (CCW) until attachment stops turning. Turn
screw out, CCW, an additional 1/4 turn.
WARNING
Cutting attachment must not turn or move when unit is idling.
CAUTION
When starting, idling adjustment speed should be adjusted not to
rotate the cutting attachment. Correct idle speed is adjusted 2300 to
2700 r/min. Or 1/4 turn CCW from the point the cutting attachment
stops moving. When there is some trouble with the carburetor, refer
to your dealer.
NOTE
Every unit is run at the factory and the carburetor is set in compli-
ance with emission regulations. Carburetor adjustments, other than
idle speed, must be performed by an authorized ECHO dealer.
G
T
RASS
RIMMER
O
PERATOR
Idle speed adjustment screw (T)
/B
C
RUSH
UTTER
'
M
S
ANUAL
27
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