Echo HC-235 - Manual (Page 20)

20
High Altitude Operation
This engine has been factory adjusted to maintain satisfactory starting,
emission, and durability performance up to 1,100 feet above sea level
(ASL) (96.0 kPa). To maintain proper engine operation and emis-
sion compliance above 1,100 feet ASL 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 ASL, the
carburetor must be re-adjusted when operating the engine below
1,100 feet ASL, otherwise severe engine damage may 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. Carburetor adjustments, other than
idle speed, must be performed by an authorized ECHO dealer.
1. Before adjusting the carburetor, clean or replace the air filter and
spark arrestor screen.
2. Start engine and run for several minutes to reach operating tem-
perature.
3 Check idle speed and reset if necessary. If a tachometer is avail-
able, idle speed screw (A) should be set to the specification found
on page 26 “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