Honda TRX500FM Owner's Manual page 149

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 gasket in the muffler, and tighten the
bolts to the specified torque:
9 lbf·ft (12 N·m , 1.2 kgf·m)
140 Servicing Your Honda
(5)