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18. EVAPORATIVE/EXHAUST EMISSION
CONTROL SYSTEM
18 EMISSION CONTROL SYSTEM .......................................................................18-1
EXHAUST
EXHAUST EMISSION CONTROL SYSTEM
DIAGRAM ...................................................18-0
SERVICE INFORMATION.....................................................................................................18-1
TROUBLESHOOTING ...........................................................................................................18-1
MAINTENANCE SCHEDULE ...............................................................................................18-2
SECONDARY AIR CLEANER...............................................................................................18-3
18
AIR INJECTION CUT-OFF VALVE (A.I.C.V.) ....................................................................18-4
REED VALVE .........................................................................................................................18-5
EXHAUST MUFFLER ............................................................................................................18-6
EXHAUST EMISSION RELATED SYSTEM INSPECTION................................................18-7
EXHAUST EMISSION CONTROL SYSTEM DIAGRAM
Fresh Air Carburetor Air Injection
Intake Manifold Vacuum Tube Cut-off Valve
Secondary Air
Inlet Tube
Crankshaft
Reed Valve
Valve Secondary
Piston Secondary Air Air Cleaner
Fresh Air
Engine Oil
Exhaust
18-0
18. EVAPORATIVE/EXHAUST EMISSION
CONTROL SYSTEM
EXHAUST EMISSION CONTROL SYSTEM
The exhaust emission control system adopted in this model utilizes the reed valve to draw
secondary air into the exhaust system for re-combustion by means of exhaust pulsation so as to
minimize the exhaust emission.
FUNCTION
Item Purpose Function
It filters the fresh air drawn for re-burning to
Secondary Air Filter secondary air. prevent dirt or dust from affecting the operation of
Cleaner the air injection cut-off valve.
The air injection cut-off valve usually opens to
lead air into the exhaust muffler in which air is re-
Prevent exhaust
Air Injection Cut- muffler noise and burned to reduce CO. When the throttle valve
off Valve closes suddenly, the air injection cut-off valve is
backfiring at sudden actuated by vacuum to close and cut off secondary
deceleration. air in order to prevent exhaust muffler backfiring
due to air in the exhaust system.
Control the secondary Whenthe reed valve operatesis less than 50km per
the motorcycle speed
Reed Valve hour, to draw secondary air
air inlet to reduce CO. into the exhaust system for re-combustion.
SERVICE INFORMATION
GENERAL INSTRUCTIONS
· During operation, be careful to avoid scalding caused by the exhaust muffler.
· Note the locations of tubes for proper installation.
· Replace any damaged tube with a new one.
· Make sure to tighten the connector of each tube securely
TOOLS SPECIFICATIONS
· Vacuum pump Air injection cut-off valve actuating pressure
250mm/Hg 30 liter/min.
Reed valve stopper clearance 6.6mm
TROUBLESHOOTING
High CO at idle speed Exhaust muffler noise
· Damaged or clogged reed valve · Faulty air injection cut-off valve
· Damaged or clogged air injection cut-off valve · Broken vacuum tube
· Clogged air cleaner · Faulty reed valve
Backfiring at sudden deceleration
· Damaged reed valve (malfunction)
· Faulty air injection cut-off valve (unable to close)
· Carburetor incorrectly adjusted
· Faulty air cut-off valve
· Leaking vacuum tube
18-1
18. EVAPORATIVE/EXHAUST EMISSION
CONTROL SYSTEM
MAINTENANCE SCHEDULE:
(1) PERIODIC MAINTENANCE
Service Mileage
Item 300 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000
System
Lubrication Fuel System Air Supply System
Engine oil R R R R R R R R R R R R R R R
Oil filter screen C C C C C
Gear oil R R R R
Motor oil filter I I I
Fuel filter I I I I
Fuel filter screen C C C C
Carburetor A A A A
Fuel line I I I
Air cleaner R R R R R R R
Charcoal canister I I I I
Secondary air cleaner I R R R
Secondary air inlet line I
Intake manifold I
screw
Purge control valve I I I I
Air lines I I I
Catalytic converter I I I I
Cam chain I I I I
System
Drive
Drive chain I I I I
Drive belt I I I I
Valve clearance I I I I
Spark 4-stroke I R
System
Ignition Others
Plug 2-stroke I R R R
C.D.I. I I I
Ignition system wires I I I
Bolts and nuts T T T T T T T T T T T T T T T
Brake system A A A A A A A A A A A A A A A
I: Inspect, A: Adjust, C: Clean, R: Replace, T: Tighten
·During riding or inspection, if any part is found to be cleaned, adjusted
Remarks or replaced, do it directly and take a record if the exhaust emission
control system is not seriously affected. It must be reported and
approved if the exhaust emission control system is seriously affected.
(2) IRREGULAR MAINTENANCE:
Item Contents
Ignition system Inspect and repair when obvious symptoms of ignition
failure, engine overheating and stalling are found frequently.
Remove carbon deposits from the exhaust system, cylinder
Carbon deposit removal head and piston head when the engine horsepower decreases
greatly during the service mileage of 1000015000 km.
Transmission system Perform CVT system maintenance and inspection when the
engine performance decreases obviously.
Severe use in the first 1000 km may cause worn or seized
Piston cylinder, piston and piston rings. Clean or replace with new
ones if necessary.
18-2
18. EVAPORATIVE/EXHAUST EMISSION
CONTROL SYSTEM
SECONDARY AIR CLEANER Center Coverl Met-in Box
REMOVAL
Remove the met-in box. ( 2-3)
Remove the center cover. ( 2- )
Remove the rear seat and rear carrier. ( 2- )
Remove the frame body covers. ( 2- )
Remove the floor board. ( 2- )
Floor Board
Secondary Air Air Injection Cut-off Valve
Disconnect the secondary air cleaner Cleaner
connecting tube.
Remove the air cleaner attaching the air
cleaner.
INSTALLATION
The installation sequence is the reverse of
removal.
Vacuum Tube
Tube to Reed Valve
DISASSEMBLY
Remove the two
· The secondary air cleaner must be
assembled and installed properly to
avoid dust entering the air cleaner.
18-3