Honda EX650 Owner's Manual page 31

5. Check for carbon deposits around the exhaust port and the spark arrester.
Use a brush to remove carbon deposits from the spark arrester screen.
Inspect the spark arrester screen for holes or tears. Replace if necessary.
NOTE: The spark arrester must be free of breaks and holes. Replace, if
necessary.
6. Install the spark arrester and the muffler in a reverse order.
Check the exhaust pipe gasket and replace if damaged. Reinstall the
muffler and the protector.
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