Echo SRM - 410U - Manual (Page 27)

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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.
Idle speed adjustment screw (T)
WARNING
Cutting attachment must not turn or move when unit is idling.
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 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.
1. Before adjusting carburetor clean or replace air filter and muffler,
“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.