G
RASS
T
RIMMER
O
PERATOR
'
S
M
ANUAL
19
Cylinder Exhaust Port
Level 3.
IMPORTANT
The cylinder exhaust port must be inspected and cleaned of excess
carbon every 3 months or 90 hours of operation in order to
maintain this engine within the emissions durability period. ECHO
strongly recommends that you return your unit to your ECHO
dealer for this important maintenance service.
CARBURETOR
ADJUSTMENT
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,
emission, and durability performance up to 1,000 feet above mean sea
level (MSL). To maintain proper engine operation above 1,000 feet MSL
the carburetor must be adjusted by an authorized ECHO service dealer.
IMPORTANT
If the engine is adjusted for operation above 1,000 feet MSL, the
carburetor must be re-adjusted when operating the engine below
1,000 feet MSL, otherwise severe engine damage can 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 emissions regulations. This carburetor does not have
acceleration and high speed adjustment needles.
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
temperature.
3.
Check idle speed and reset if necessary. If a tachometer is avail-
able, idle speed screw (A) should be set to the specifications found
on page 23 "Specifications" of this manual. Turn idle screw (A)
clockwise to increase idle speed; counter clockwise to decrease idle
speed.
A
