Honda FG400 Owner's Manual page 42

SERVICING YOUR HONDA TILLER
3. Use a brush to remove carbon deposits from the spark arrester screen. Be
careful to avoid damaging the screen.
The spark arrester must be free of breaks and holes. Replace the spark
arrester if it is damaged.
SPARK ARRESTER SCREEN
4. Install the spark arrester and muffler protector, in the reverse order of
disassembly.
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