G
RASS
T
RIMMER
O
PERATOR
'
S
M
ANUAL
23
1. Remove two (2) muffler cover screws and muffler cover (A).
2. Place piston at Top Dead Center (TDC) to prevent carbon/dirt from
entering cylinder.
3. Remove spark arrestor screen cover (B), screen holder (C), gasket
(D) and screen (E) from muffler body.
4. Clean carbon deposits from screen and muffler components.
5. Replace screen if it is cracked, plugged or has holes burned
through.
6. Assemble components in reverse order.
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 Adjustment
High altitude adjustment is not required for proper operation of this
engine.
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 EPA Emission Regulations. This carburetor does not
have acceleration and high speed adjustment needles.
B
C
D
E
A