Evaporative Emission (Evap) Control System; Noise Emission Control System - Honda Motorcycle Service Manual

EMISSION CONTROL SYSTEMS
EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM (California model only)
All Honda motorcycles and scooters sold in California for street use comply with the California Air Resources Board
requirements for evaporative emission regulations.
Fuel vapor from the fuel tank and carburetors is routed into the evaporative emission canister (EVAP canister) where it is
absorbed and stored while the engine is stopped. When the engine is running and the evaporative emission purge control
valve (EVAP purge control valve) is open fuel vapor in the EVAP canister is drawn into the engine through the carburetor.
At the same time, the evaporative emission carburetor air vent control valve (EVAP CAV control valve) is open and air is
drawn into the carburetor through the valve.
CARBURETORS
EVAPORATIVE EMISSION
PURGECONTROLVALVE
CANISTER (EVAP CANISTER)
EVAPORATIVE EMISSION CARBURETOR
AIR VENT CONTROL VALVE
AIR
I
4
/ I
a:
FRESH AIR
t:
FUEL VAPOR
-
+ - -
(EVAP CAV EVAPORATIVE CONTROL EMISSION VALVE)
NOISE EMISSION CONTROL SYSTEM
t
TO OPEN
TAMPERING WITH THE NOISE CONTROL SYSTEM IS PROHIBITED: Federal law prohibits the following acts or the causing
thereof: (1) The removal or rendering inoperative by any person, other than for purposes of maintenance, repair or replace-
ment, of any device or element of design incorporated into any new vehicle for the purpose of noise control prior to its sale or
delivery to the ultimate purchaser or while it is in use; or (2) the use of the vehicle after such device or element of design has
been removed or rendered inoperative by any person.
CARBURETOR
AI R VENT CONTROL
VALVE (AT ENGINE STOP)
AMONG THOSE ACTS PRESUMED TO CONSTITUTE TAMPERING ARE THE ACTS LISTED BELOW:
1. Removal of, or puncturing the muffler, baffles, header pipes or any other component which conducts exhaust gases
2. Removal of, or puncturing of any part of the intake system
3. Lack of proper maintenance.
4. Replacing any moving parts of the vehicle, or parts of the exhaust or intake system, with parts other than those specified
by the manufacturer.
Date of issue: March, 1995
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HONDA MOTOR CO.,LTD.