Kymco MO KXR 250 Service Manual - chap 05 (carburante)
5. FUEL SYSTEM
5-0
Mongoose/KXR 250
5
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FUEL SYSTEM
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SERVICE INFORMATION -------------------------------------------- 5- 2
TROUBLESHOOTING ------------------------------------------------- 5- 3
FUEL TANK------------------------------------------------------------- 5- 4
FUEL VALVE REMOVAL -------------------------------------------- 5- 4
THROTTLE VALVE ----------------------------------------------------- 5- 7
CARBURETOR ---------------------------------------------------------- 5- 8
AIR CLEANER ---------------------------------------------------------- 5-12
5
5. FUEL SYSTEM
5-1
Mongoose/KXR 250
5. FUEL SYSTEM
5-2
Mongoose/KXR 250
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 reassembly.
• 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 shop towel to prevent
foreign matters from entering.
• When cleaning the carburetor air and fuel jets, the O-rings and diaphragm must be removed first to
avoid damage. Then, clean with compressed air.
• 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.
SPECIFICATIONS
Item
Standard
Type
PD
Venturi dia.
f22
Float level
14.8mm
Main jet No.
98
Adjust method
Piston
Idle speed
1500±100rpm
Throttle grip free play
1_ 4mm
Air screw opening
11/8±1/2
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
Mongoose/KXR 250
SPECIAL TOOL
Float level gauge
TROUBLESHOOTING
Engine cranks but won’t start Engine lacks power
• No fuel in tank • Clogged air cleaner
• No fuel to carburetor • Faulty carburetor
• Cylinder flooded with fuel • Faulty ignition system
• No spark at plug
• Clogged air cleaner Lean mixture
• Intake air leak • Clogged carburetor fuel jets
• Improper throttle operation • Float level too low
• Intake air leak
Engine idles roughly, stalls or runs poorly • Clogged fuel tank cap breather hole
• Excessively used choke • Kinked or restricted fuel line
• Ignition malfunction
• Faulty carburetor Rich mixture
• Poor quality fuel • Float level too high
• Lean or rich mixture • Clogged air jets
• Incorrect idle speed • Clogged air cleaner
Misfiring during acceleration
• Faulty ignition system
• Faulty carburetor
Backfiring at deceleration
• Float level too low
• Incorrectly adjusted carburetor
• Faulty exhaust muffler
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