MAINTENANCE
402S
50
X7503256304
© 11/23 ECHO Incorporated
Cooling System Cleaning
• Check periodically.
• Clogged fins will result in poor
engine cooling.
1.
Remove air cleaner cover,
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 Arrester Muffler
• The spark arrester muffler controls the exhaust noise and prevents hot,
glowing particles of carbon from leaving the muffler.
• Make sure the spark arrester 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 arrester.
This requirement also applies to all U.S. Forest Service lands. In some of
these areas, the spark arrester 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 Arrester Screen
Carbon deposits in muffler will cause drop in engine output and
overheating. Spark arrester screen must be checked periodically.
1.
Remove air cleaner cover and
remove spark plug lead.
2.
Remove spark arrester 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.
A
B
C