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.

BEFOREMAKINGADJUSTMENTS:

•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.

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