Kymco MO D200 Service Manual - chap 13 (alimentazione)
13. FUEL SYSTEM/CARBURETOR/FUEL PUMP
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FUEL SYSTEM/CARBURETOR/FUEL PUMP
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SCHEMATIC DRAWING ---------------------------------------------- 13- 1
SERVICE INFORMATION -------------------------------------------- 13- 4
TROUBLESHOOTING ------------------------------------------------- 13- 4
CARBURETOR REMOVAL ------------------------------------------- 13- 6
VACUUM CHAMBER DISASSEMBLY------------------------------ 13- 6
FLOAT CHAMBER DISASSEMBLY--------------------------------- 13- 8
AUTO BYSTARTER INSPECTION/REMOVAL-------------------- 13-10
AIR CUT-OFF VALVE (A.C.V.)-------------------------------------- 13-11
AUTO BYSTARTER INSTALLATION ------------------------------ 13-13
FLOAT CHAMBER ASSEMBLY ------------------------------------- 13-14
FLOAT LEVEL INSPECTION ---------------------------------------- 13-15
VACUUM CHAMBER ASSEMBLY ---------------------------------- 13-15
CARBURETOR INSTALLATION ------------------------------------ 13-16
FUEL PUMP REMOVAL/DISASSEMBLY -------------------------- 13-17
FUEL PUMP INSPECTION-------------------------------------------- 13-18
FUEL PUMP ASSEMBLY --------------------------------------------- 13-18
FUEL PUMP INSTALLATION --------------------------------------- 13-19
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13. FUEL SYSTEM/CARBURETOR/FUEL PUMP
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FUEL SYSTEM
13. FUEL SYSTEM/CARBURETOR/FUEL PUMP
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SCHEMATIC DRAWING
13. FUEL SYSTEM/CARBURETOR/FUEL PUMP
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FUEL PUMP
CONSTRUCTION:
The fuel pump adopted for this model is a vacuum-type fuel pump which utilizes the positive and
negative pulsating pressures produced by the engine crankcase to control the oil pump diaphragms
and deliver fuel from the fuel tank to the carburetor through the suction valve and outlet valve.
FUEL PUMP CONSTRUCTION
Diaphragms
Inlet
Outlet
Suction Valve
Outlet Valve
Pulsating Pressure
from Crankcase
13. FUEL SYSTEM/CARBURETOR/FUEL PUMP
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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 auto bystarter.
• 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.
SPECIFICATIONS
Venturi dia. (mm)
VE26
Identification number
VE090
Float level (mm)
18.5
Pilot screw opening
2±_
Main jet
102#
Slow jet
35#
Idle speed
1600±100rpm
Fuel pump output
40cc/1600rpm/10 seconds
SPECIAL TOOLS
Float level gauge
Fuel unit remover
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
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Throttle does not open fully, so engine stalls Rich mixture
• Damaged vacuum piston diaphragm • Auto bystarter valve opens excessively
• Clogged diaphragm hole • Faulty float valve
• Float level too high
Lean mixture • Clogged air jets
• Clogged fuel jets • Auto bystarter valve set plate installed in
• Clogged fuel tank cap breather hole
the wrong groove
• 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
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