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© 08/2013 ECHO Inc.
MAINTENANCE CS-310
Cooling System Cleaning
• Check periodically.
• Clogged fins will result in poor engine cooling.
1. Remove cylinder cover and starter.
2. Use compressed air or wooden tool to remove dirt and dust
from between fins to let cooling air pass easily.
Spark Arrestor Muffler
• The spark arrestor muffler controls the exhaust noise and prevents hot, glowing particles of carbon from
leaving the muffler.
• Make sure the spark arrestor screen is in good repair and properly seated in the muffler.
• Certain internal combustion engines operated on forest, brush, and/or grass-covered areas in the states of
Washington, Oregon, Idaho, California, Minnesota, New Jersey and Maine, are required to be equipped
with a spark arrestor.
This requirement also applies to all U.S. Forest Service lands. In some of these areas, the spark arrestor
system must be certified per USDA Forest Service Regulation SAE J335.
Check with your local or state authorities for specific regulations in your area. Failure to follow these
requirements is a violation of the law.
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.
Cylinder fins
A
C
B