32 X7503196706
© 09/2013 ECHO Inc.
MAINTENANCE CS-450
Exhaust Port Cleaning
Level 2.
1. Remove air cleaner cover and remove spark plug lead.
2. Remove guide bar and saw chain. See "Guide Bar and Saw
Chain Installation/Removal."
3. Remove muffler support bracket (A).
4. Place piston at top dead center.
5. Remove muffler. Check parts for wear or damage, and
replace if necessary.
6. 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.
7. Install muffler. Tighten muffler mounting bolts (or nuts) to
7-11 N•m (60-95 in•lbf).
8. Install muffler support bracket (A).
9. Install guide bar and saw chain. See "Guide Bar and Saw
Chain Installation/Removal."
10. Install spark plug lead and air cleaner cover.
11. Start engine, and warm to operating temperature. Stop
engine.
12. Remove air cleaner cover and remove spark plug lead.
13. Remove guide bar and saw chain. See "Guide Bar and Saw Chain Installation/Removal."
14. Remove muffler support bracket.
15. Re-tighten mounting bolts (or nuts) to 7-11 N•m (60-95 in•lbf).
16. Install muffler support bracket.
17. Install guide bar and saw chain. See "Guide Bar and Saw Chain Installation/Removal."
18. Install spark plug lead and air cleaner cover.
Parts Required: As needed: Muffler gasket
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