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CS-400F MAINTENANCE
© 12/2013 ECHO Inc.
X7503253302 33
Spark Arrestor Screen
Carbon deposits in muffler will cause drop in engine output and
overheating. Spark arrestor screen must be checked
periodically.
1. Remove air cleaner cover and remove spark plug lead.
2. Remove spark arrestor cover (C) and screen (B) from
muffler (A) body.
3. Clean carbon deposits from muffler components.
4. Replace screen if it is cracked, or has holes burned through.
5. Assemble components in reverse order.
Note: When cleaning carbon deposit, be careful not to damage the catalytic element inside muffler.
Exhaust Port Cleaning
Level 2.
1. Remove air cleaner cover and remove spark plug lead.
2. Remove engine cover.
3. Place piston at top dead center.
4. Remove muffler. Check parts for wear or damage, and
replace if necessary.
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.
5. Use a wood or plastic scraping tool to clean deposits from
cylinder exhaust port.
6. Install muffler. Tighten muffler mounting bolts (or nuts) to
8-11 N•m (70-95 in•lbf).
7. Install engine cover and attach spark plug lead.
8. Replace air cleaner cover.
9. Start engine, and allow unit to warm up at idle for several
minutes.
10. Stop engine, and re-tighten mounting bolts (or nuts) to 8-11 N•m (70-95 in•lbf).
11. Install guide bar and chain. Adjust chain tension.
12. 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
A
C
B