Evaporative Emission Control System (California Model Only); Noise Emission Control System; Tampering Acts List - Honda Nighthawk CB 750 1991 Service Manual

General Information
Evaporative Emission Control System(Ca1ifornia Model Only)
This vehicle complies with the California Air Resources Board requirements for evaporative emission regulations
Fuel vapor from the fuel tank and carburetor 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
diaphragm 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.
(California Model Only)
(1) EVAP PURGE
@
(3) FRESH AIR
a
:
(5) EXHAUST PORT
:
(6):FRESH AIR
' (7)
EVAP CAV
CONTROL
VALVE
Noise Emission Control Svstem
TAMPERING WITH THE NOISE CONTROL SYSTEM IS PROHIBITED: Federal law prohibits the following acts or the cau-
sing thereof: (1) the removal or rendering inoperative by any person, other than for purposes of maintenance, repair or
replacement, of any device or element of design incorporated into any new vehicle for 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.
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 parts of the intake system.
3.Lack of proper maintenance.
4.Replacing any moving parts of the vehicle, or pans of the exhaust or intake system, with parts other than those spec-
ified by the manufacturer.