Kymco MO FILLY 50LX Service Manual - chap 18 (scarico)
18. EVAPORATIVE/EXHAUST EMISSION
CONTROL SYSTEM
18-0
FILLY LX 50
18
EXHAUST EMISSION CONTROL SYSTEM DIAGRAM
18
EXHAUST EMISSION CONTROL SYSTEM DIAGRAM
.................................................
18-0
EXHAUST EMISSION CONTROL SYSTEM
......................................................................
18-1
SERVICE INFORMATION
....................................................................................................
18-1
TROUBLESHOOTING
...........................................................................................................
18-1
MAINTENANCE SCHEDULE
..............................................................................................
18-2
SECONDARY AIR CLEANER
...............................................................................................
18-3
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
Secondary
Air Cleaner
Carburetor
Fresh Air
Fresh Air
Exhaust
Intake Manifold
Piston
Crankshaft
Engine Oil
Valve
Reed Valve
Secondary
Air Inlet
Secondary Air
Vacuum Tube
Air Injection
Cut-off Valve
18. EVAPORATIVE/EXHAUST EMISSION
CONTROL SYSTEM
18-1
FILLY LX 50
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
Secondary Air
Cleaner
Filter secondary air.
It filters the fresh air drawn for re-burning to
prevent dirt or dust from affecting the operation of
the air injection cut-off valve.
Air Injection Cutoff Valve
Prevent exhaust
muffler noise and
backfiring at sudden
deceleration.
The air injection cut-off valve usually opens to lead
air into the exhaust muffler in which air is reburned to reduce CO. When the throttle valve
closes suddenly, the air injection cut-off valve is
actuated by vacuum to close and cut off secondary
air in order to prevent exhaust muffler backfiring
due to air in the exhaust system.
Reed Valve
Control the secondary
air inlet to reduce CO.
When the motorcycle speed is less than 50km per
hour, the reed valve operates to draw secondary air
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. EVAPORATIVE/EXHAUST EMISSION
CONTROL SYSTEM
18-2
FILLY LX 50
MAINTENANCE SCHEDULE:
(1) PERIODIC MAINTENANCE
Service Mileage
Item
300
1000
2000
3000
4000
5000
6000
7000
8000
9000
100001100012000130001400015000
Engine oil
RRRRRRR
R
Oil filter screen
CCCCC
Gear oil
RRR
R
Lubrication
System
Motor oil filter
III
Fuel filter
III
I
Fuel filter screen
CCC
C
Carburetor
AAA
A
Fuel System
Fuel line
III
Air cleaner
CRR
R
Charcoal canister
III
I
Secondary air cleaner
IRR
R
Secondary air inlet line
I
Intake manifold screw
I
Purge control valve
III
I
Air lines
III
Air Supply System
Catalytic converter
III
I
Cam chain
III
I
Drive chain
III
I
Drive belt
III
I
Drive
System
Valve clearance
III
I
Spark
4-stroke
I
R
Plug
2-stroke
IRR
R
C.D.I.
III
Ignition
System
Ignition system wires
III
Bolts and nuts
TTTTTTTTTTTTTTT
Other
Brake system
AAAAAAAAAAAAAAA
Remarks
I: Inspect, A: Adjust, C: Clean, R: Replace, T: Tighten
•During riding or inspection, if any part is found to be cleaned, adjusted
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.
Carbon deposit removal
Remove carbon deposits from the exhaust system, cylinder
head and piston head when the engine horsepower decreases
greatly during the service mileage of 10000_ 15000 km.
Transmission system
Perform CVT system maintenance and inspection when the
engine performance decreases obviously.
Piston
Severe use in the first 1000 km may cause worn or seized
cylinder, piston and piston rings. Clean or replace with new
ones if necessary.
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