Kymco MO X500 Service Manual - chap 05 (alimentazione)
5. FUEL SYSTEM/FUEL PUMP
/FUEL TANK/CARBURETOR
XCITING 500
5
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FUEL SYSTEM/FUEL PUMP/
FUEL TANK/CARBURETOR
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SCHEMATIC DRAWING-------------------------------------------------- 5- 1
FUEL SYSTEM -------------------------------------------------------------- 5- 2
FUEL PUMP CONSTRUCTION ------------------------------------------ 5- 2
SERVICE INFORMATION ------------------------------------------------ 5- 3
TROUBLESHOOTING ----------------------------------------------------- 5- 4
CARBURETOR -------------------------------------------------------------- 5- 5
FUEL FILTER/FUEL PUMP-----------------------------------------------5-16
FUEL TANK------------------------------------------------------------------5-18
5
5-0
5. FUEL SYSTEM /FUEL PUMP
/FUEL TANK/CARBURETOR
SCHEMATIC DRAWING
XCITING 500
5-1
5. FUEL SYSTEM/FUEL PUMP
/FUEL TANK/CARBURETOR
XCITING 500
FUEL SYSTEM
The fuel pump is operated by an electromagnetic force and its electrical energy is supplied from the
battery. The fuel sent under pressure by the fuel pump flows into the float chamber when the float of
the carburetor has dropped and the needle valve is open. When the needle valve closes, the pressure of
the fuel in the hose connecting the carburetor and the fuel pump increases, and when the set pressure
is reached, the operation of the fuel pump is stopped by the fuel pressure to prevent excessive supply.
FUEL PUMP CONSTRUCTION
When voltage is applied between the fuel pump terminals, current flows into the solenoid coil which
then pulls up the plunger together with the diaphragm allowing fuel to be drawn into the pump. At this
time, the contact which is linked with the plunger opens and interrupts current causing the coil to be
de-energized. This allows the diaphragm to go down by the spring force, thereby pressurizing and
delivering fuel to the outlet. When the fuel pressure builds up and overcomes the spring force, the
plunger stops at pulled up position with the contact in open position.
5-2
5. FUEL SYSTEM /FUEL PUMP
/FUEL TANK/CARBURETOR
XCITING 500
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• When working with gasoline, keep away from sparks and flames.
• Note the locations of O-rings when disassembling and replace them with new ones during
assembly.
• Before float chamber disassembly, drain the residual gasoline from the float chamber.
• Do not try to disassemble the automatic choke.
• When assembling the vacuum chamber and air cut-off valve, be careful not to damage the
diaphragms.
• All cables, fuel lines and wires must be routed and secured at correct locations.
• When removing the fuel tank, keep sparks and flames away from the working area.
• When removing the fuel tank, the remaining fuel in the tank must be lower than 1/2 of the fuel
tank capacity to avoid gasoline overflowing.
• Fuel tank capacity: 12.8 liters
SPECIFICATIONS
XCITING 500
Type CVK
Carburetor identification number 15F8 SD8
Size of bore (mm) Ø36
Main jet #108
Slow jet #38
Idle speed 1400±100
Pilot screw opening 3½ ± ½ turns out
Fuel pump flow (at 12V) 370 ml (12.6 US oz, 13 lmp oz)/min
5-3
5. FUEL SYSTEM/FUEL PUMP
/FUEL TANK/CARBURETOR
XCITING 500
TROUBLESHOOTING
Engine does not start Engine idles roughly, stalls or runs poorly
• No fuel in tank • Incorrect idle speed
• Restricted fuel line • Rich mixture
• Too much fuel getting to cylinder • Lean mixture
• Clogged air cleaner • Clogged air cleaner
• Contaminated fuel • Intake air leak
• Faulty fuel pump • Contaminated fuel
• Faulty air-cut off valve
• Damaged vacuum tube and connectors
• Damaged carburetor insulator
Throttle does not open fully, so engine stalls Rich mixture
• Damaged vacuum piston diaphragm • Automatic valve opens excessively
• Clogged diaphragm hole • Faulty float valve
• Float level too high
Lean mixture • Clogged air jets
• Clogged fuel jets • Automatic choke valve set plate installed in
• Clogged fuel tank cap breather hole
• Clogged fuel filter •Clogged air cleaner
• Bent, kinked or restricted fuel line
• Faulty float valve
• Float level too low
• Faulty fuel pump or insufficient output
the wrong groove
Engine is hard to start
• No fuel in tank
• Restricted fuel line
• Clogged fuel strainer
• Faulty fuel pump
• Broken or clogged vacuum tube
• Faulty or clogged charcoal canister
Lean mixture
• Clogged charcoal canister
• Bent, kinked or restricted fuel line
• Clogged fuel strainer
• Float level too low
5-4
5. FUEL SYSTEM /FUEL PUMP
r
r
/FUEL TANK/CARBURETOR
CARBURETOR
REMOVAL
Remove the luggage box (page 2-3)
Loosen the air cleaner clamp screw.
Loosen the carburetor clamp screw.
Disconnect the vacuum hose from the
carburetor.
Pull the carburetor out from the air cleaner
and intake manifold.
.
Disconnect the fuel hose from the
carburetor.
Disconnect the carburetor heater connector.
XCITING 500
Carburetor Clamp Screw
Air Cleaner Clamp Screw Vacuum Hose
Fuel Hose
Disconnect the throttle cables.
Disconnect the automatic choke connector.
Disconnect the T.P.S connector.
Remove the carburetor.
5-5
Carburetor Heater Connecto
T.P.S Connector Throttle Cables
Automatic Choke Connecto
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