Kymco MO P125 150 Service Manual - chap 05 (carburante)
5. FUEL SYSTEM
5-0
PEO PLE 12 5/ 15 0
5
FUEL SYSTEM
SERVICE INFORMATION..........................................................5-2
TROUBLESHOOTING ................................................................5-3
CARBURETOR REMOVAL ........................................................5-4
AUTO BYSTARTER....................................................................5-4
AIR CUT-OFF VALVE................................................................5-6
VACUUM CHAMBER .................................................................5-6
FLOAT CHAMBER.....................................................................5-7
CARBURETOR INSTALLATION .............................................. 5-10
FUEL TANK..............................................................................5-11
FUEL UNIT ............................................................................... 5-11
AUTO FUEL VALVE................................................................. 5-12
AIR CLEANER.......................................................................... 5-13
5
5. FUEL SYSTEM
5-1
PEO PLE 125/150
FUEL SYSTEM
5. FUEL SYSTEM
5-2
PEO PLE 125/150
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• Do not bend or twist control cables. Damaged control cables will not operate smoothly.
• When disassembling fuel system parts, note the locations of O-rings. Replace them with new
ones during assembly.
• Before float chamber disassembly, loosen the drain screw to drain the residual gasoline into a
clean container.
• After the carburetor is removed, plug the intake manifold side with a clean towel to prevent
foreign matters from entering.
• Remove the vacuum diaphragm before cleaning the carburetor air and fuel passages with
compressed air to avoid damaging the vacuum diaphragm.
• When the motorcycle is not used for over one month, drain the residual gasoline from the float
chamber to avoid erratic idling and clogged slow jet due to deteriorated fuel.
• The pilot screw is factory pre-set and no adjustment is necessary. During carburetor
disassembly, note the number of turns of the pilot screw and use as a reference when reinstalling
it.
• A tachometer must be used when adjusting the engine speed.
• Turn the pilot screw in or out slowly to obtain the highest engine speed.
SPECIFICATIONS
125 cc
150 cc
Item
Standard
Standard
Venturi dia. (mm)
22.1
22.1
Identification number
VE052A
VE054A
Float level (mm)
17.5
17.5
Main jet
#108
#110
Slow jet
#35
#35
Idle speed
1700±100rpm
1700±100rpm
Throttle grip free play
2_ 6mm
2_ 6mm
Pilot screw opening
3
3
/8
2
1
/2
SPECIAL TOOL
Float level gauge
Gasoline is very dangerous. When working with gasoline, keep sparks and flames away
from the working area.
Gasoline is extremely flammable and is explosive under certain conditions. Be sure to
work in a well-ventilated area.
＊
5. FUEL SYSTEM
5-3
PEO PLE 125/150
TROUBLESHOOTING
Engine is hard to start Misfiring during acceleration
• No spark at plug • Faulty ignition system
• Compression too low • Lean mixture
• No fuel to carburetor
-Clogged fuel filter Engine idles roughly, stalls or runs poorly
-Restricted fuel line • Clogged fuel system
-Faulty float valve • Ignition malfunction
-Incorrectly adjusted float level • Rich or lean mixture
• Engine flooded with fuel • Contaminated fuel
-Clogged air cleaner • Intake air leak
-Fuel overflowing • Incorrect idle speed
• Intake air leak • Incorrectly adjusted pilot screw
• Contaminated fuel • Clogged idle system or auto bystarter passages
• Faulty auto bystarter • Incorrectly adjusted float level
• Clogged idle system or auto bystarter passages
Lean mixture
Rich mixture • Clogged fuel jets
• Faulty auto bystarter • Faulty float valve
• Faulty float valve • Float level too low
• Float level too high • Clogged fuel system
• Clogged air jets • Intake air leak
• Dirty air cleaner • Faulty vacuum piston
• Flooded carburetor • Faulty throttle
Backfiring at deceleration
• Faulty air cut-off valve
• Lean mixture in idle system
5. FUEL SYSTEM
5-4
PEO PLE 125/150
CARBURETOR REMOVAL
Remove the frame body cover. (!2)
Disconnect the auto bystarter wire connector.
Loosen the drain screw and drain the fuel
from the float chamber.
Disconnect the fuel tube and vacuum tube at
the carburetor.
Loosen the throttle cable adjusting nut and
lock nut, and disconnect the throttle cable
from the carburetor.
Loosen the carburetor intake manifold band
and air cleaner connecting tube band screws
and then remove the carburetor.
AUTO BYSTARTER
OPERATION INSPECTION
Measure the resistance between the auto
bystarter wire terminals.
Resistance: 5W max. (10 minutes
minimum after stopping the engine)
If the reading is not within the limit, replace
the auto bystarter with a new one.
Auto Bystarter Wire
Adjusting Nut
Fuel Tube
Intake Manifold
Band
Air Cleaner Connecting
Tube Band
Throttle Cable
Vacuum Tube
Lock Nut
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