The charcoal canister is part of the evaporative emission control system. This system prevents the escape of raw gasoline vapors from the fuel tank and carburetor. The activated charcoal element within the canister acts as a storage device for the fuel vapors at times when engine operating conditions do not allow burning of the vapors.
Periodic replacement of the canister is not required, however, if the charcoal element is saturated (possibly from engine flooding), the entire canister will require replacement.
On models through 1992, the hoses should be inspected and a careful operational check be performed at 60,000 miles (96,000 km). On 1993 and later models, there is no maintenance interval recommended by Honda. However, it is still a good idea to inspect the condition of the hoses at 60,000 mile (96,000 km) intervals. See Driveability & Emissions Controls for testing procedures.