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MUFFLER SPARK ARRESTOR
IMPORTANT
Carbon deposits in muffler will cause a drop in engine output
and overheating. Spark arrestor screen must be checked
periodically.
1. Remove air filter cover and remove spark plug lead.
2. Remove two guide bar nuts and remove sprocket guard.
3. Remove three muffler cover screws and remove muffler cover.
4. Remove spark arrestor screen cover, gaskets, and screen from
muffler body.
5. Clean carbon deposits from muffler components.
NOTE
When cleaning carbon deposit, be careful not to damage the
catalytic element inside muffler.
6. Replace screen if it is cracked, plugged, or has holes burned
through.
7. Assemble components in reverse order.
Cylinder Exhaust Port
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.
BEFORE MAKING ADJUSTMENTS:
• The correct spark plug must be clean and properly gapped.
• The air filter element must be clean and properly installed.
• The muffler spark arrestor screen and exhaust port must be clear
of carbon.
• The standard bar and chain combination (see page 4) must be
installed to the power head, and properly tensioned.