CS-4010
MAINTENANCE
X7503380000
49
7/22 ECHO Incorporated
8.
Start engine, and allow unit to warm up at idle for several minutes.
9.
Stop engine, and re-tighten mounting bolts (or nuts) to 7 - 9 N•m (60-80
in•lbf).
10. Install guide bar and chain. Adjust chain tension.
11. Start engine and check for exhaust leaks between muffler and cylinder
head. Stop engine if leak is found and correct problem before operating
chain saw.
Carburetor Adjustment
Every unit is run at the factory and the carburetor is set in compliance with
emission regulations. In addition, the carburetor is equipped with “
H
” (High
Speed) and “
L
” (Low Speed) needle adjustment limiters that prevent
settings outside acceptable limits.
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 and
durability performance up to 335 m (1,100 ft.) above sea level (ASL)
(96.0 kPa). To maintain proper engine operation above 335 m (1,100 ft.)
ASL the carburetor might need to be adjusted by an authorized service
dealer.
If the engine is adjusted for operation above 335 m (1,100 ft.) ASL,
the carburetor must be readjusted when operating the engine below
335 m (1,100 ft.) ASL, otherwise severe engine damage can result.
1.
Before adjusting carburetor clean or replace air filter and muffler spark
arrester screen.
2.
Make sure the bar and chain are properly adjusted.
3.
Start engine and run several minutes to bring to operating temperature.
Flash choke twice during warm-up to clear any air from the fuel system.
4.
Stop engine. Turn “
H
” High Speed needle counterclockwise (CCW) to
stop. Turn “
L
” Low Speed needle midway between full clockwise (CW)
stop and CCW stop.
5.
Idle Speed Adjustment:
