Echo SRM-410U manual Carburetor Adjustment, Engine Break-In, High Altitude Operation

GRASS TRIMMER/BRUSH CUTTER 27

OPERATOR'S MANUAL

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 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.

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.

Idle speed adjustment screw (T)