G
RASS
T
RIMMER
/B
RUSH
C
UTTER
O
PERATOR
'
S
M
ANUAL
21
1.
Remove engine cover (A). See “Cleaning Cooling System” pages
19 & 20 for step by step instructions.
2.
Place piston at Top Dead Center (TDC) to prevent carbon/dirt from
entering cylinder.
3.
Remove spark arrestor screen cover (B), gasket (C), and screen (D),
from muffler body.
4.
Clean carbon deposits from 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 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 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 emission regulations. This carburetor does not have
acceleration and high speed adjustment needles.
A
B
C
