Kymco MO Yup50 Service Manual - chap 11 (carburatore)
11. CARBURETOR
11-0
YUP 5 0
11
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CARBURETOR
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SERVICE INFORMATION........................................................ 11- 2
TROUBLESHOOTING.............................................................. 11- 2
THROTTLE VALVE DISASSEMBLY ....................................... 11- 3
THROTTLE VALVE INSTALLATION...................................... 11- 4
CARBURETOR REMOVAL....................................................... 11- 5
AUTO BYSTARTER................................................................. 11- 6
FLOAT CHAMBER................................................................... 11- 8
FLOAT LEVEL INSPECTION .................................................. 11-10
CARBURETOR INSTALLATION.............................................. 11-11
AIR SCREW ADJUSTMENT ..................................................... 11-11
REED VALVE.......................................................................... 11-12
FUEL TANK ............................................................................ 11-13
11
11. CARBURETOR
11-1
YUP 5 0
11. CARBURETOR
11-2
YUP 5 0
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.
• All cables, fuel lines and wires must be routed and secured at correct locations.
• Bleed air from the oil lines whenever they are disconnected.
SPECIFICATIONS
YUP 50
Venturi dia.
14mm
Identification number
PB058
Float level
8.6mm
Main jet
#75
Slow jet
#35
Air screw opening
1_ ± _
Idle speed
2000±100rpm
Throttle grip free play
2_ 6mm
SPECIAL TOOL
Float level gauge
TROUBLESHOOTING
Engine does not start Lean mixture
• No fuel in tank • Clogged fuel jets • Faulty float valve
• Too much fuel getting to cylinder • Clogged fuel cap vent • Float level too low
• Clogged fuel filter • Clogged fuel filter • Clogged air cleaner
• Clogged air cleaner • Bent, kinked or restricted fuel line
Engine idles roughly, stalls or runs poorly Rich mixture
• Incorrect idle speed • Clogged air cleaner • Faulty float valve
• Ignition malfunction • Intake air leaks • Float level too high
• Compression too low • Fuel contaminated • Clogged air jets
• Incorrectly adjusted air screw • Faulty reed valve
• Incorrect float level • Clogged fuel jets
A
11. CARBURETOR
11-3
YUP 5 0
THROTTLE VALVE DISASSEMBLY
Remove the rear carrier. (!12-5)
Remove the met-in box. (!12-4)
Loosen the carburetor cap and remove the
throttle valve.
Disconnect the throttle cable from the
throttle valve.
Remove the throttle valve spring, carburetor
cap and rubber seal.
Carburetor Cap
Throttle Valve
Rubber Seal
Carburetor Cap
Spring
11. CARBURETOR
11-4
YUP 5 0
Remove the jet needle by removing the
needle clip.
Check the jet needle and throttle valve for
wear or damage.
THROTTLE VALVE INSTALLATION
Install the jet needle on the throttle valve
and secure with the needle clip.
Install the rubber seal on the throttle cable
and then install the carburetor cap and
throttle valve spring.
Connect the throttle cable to the throttle
valve.
Carburetor Cap
Throttle Valve
Rubber Seal
Throttle Cable
Throttle Valve Spring
Needle Retainer
2nd Notch (STD)
Throttle Valve
Jet Needle
Needle Clip
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