Honda TRX400X 2009 Owner's Manual page 126

Spark Arrester
3. Use a brush to remove carbon deposits from the spark arrester screen
( ). Be careful to avoid damaging the spark arrester screen. 5
The spark arrester must be free of breaks and holes. Replace, if
necessary. Check the gasket. Replace, if necessary.
(5) spark arrester screen
4. Install the spark arrester and the gasket in the muffler and tighten the
bolts securely.
Servicing Your Honda
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(5)