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1. Remove muffler cover screw 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), gasket (C), and screen (D),
from muffler body.
4. Clean carbon deposits from muffler components.
NOTE
When cleaning carbon deposit, be careful not to damage the
catalytic element inside muffler.
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 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.
B
C
D
A
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