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© 08/2013 ECHO Inc.
MAINTENANCE CS-303T
Spark Arrestor Screen
Carbon deposits in muffler will cause a drop in engine output
and overheating. Spark arrestor screen must be checked
periodically.
1. Remove muffler cover.
2. Remove spark arrestor screen cover, gaskets, and screen
from muffler body.
3. Clean carbon deposits from muffler components.
Note: When cleaning carbon deposit, be careful not to damage the catalytic element inside muffler.
4. Replace screen if it is cracked, plugged, or has holes burned through.
5. Assemble components in reverse order.
Exhaust Port Cleaning
Level 2.
1. Remove spark plug lead.
2. Remove muffler cover.
3. Place piston at top dead center.
4. Remove muffler. Check parts for wear or damage, and replace
if necessary.
5. Use a wood or plastic scraping tool to clean deposits from cylinder exhaust port.
Never use a metal tool to scrape carbon from the exhaust port. Do not scratch the cylinder or piston when
cleaning the exhaust port. Do not allow carbon particles to enter the cylinder.
6. Install muffler. Tighten bolts to 9-11 N•m (80-95 in•lbf).
7. Connect spark plug lead.
8. Start engine, and allow unit to warm up at idle for several minutes.
9. Stop engine, and re-tighten mounting nuts to 9-11 N•m (80-95 in•lbf).
10. Install muffler cover.
11. Start engine and check for exhaust leaks between muffler and cylinder head. Stop engine if leak is
found and correct problem before operating chain saw.
Parts Required: As needed: Muffler gasket