Kymco MO MXer50 Service Manual - chap 05 (alimentazione)

5. FUEL SYSTEM

5-0

MX’er 50

5

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FUEL SYSTEM

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SERVICE INFORMATION -------------------------------------------- 5- 2

TROUBLESHOOTING ------------------------------------------------- 5- 2

THROTTLE VALVE DISASSEMBLY/CARBURETOR REMOVAL- 5- 3

AUTO BYSTARTER---------------------------------------------------- 5- 6

FLOAT/FLOAT VALVE/JETS ---------------------------------------- 5- 8

CARURETOR INSTALLATION -------------------------------------- 5-11

AIR SCREW ADJUSTMENT ------------------------------------------ 5-12

REED VALVE----------------------------------------------------------- 5-13

FUEL TANK------------------------------------------------------------- 5-14

FUEL VALVE REMOVAL -------------------------------------------- 5-15

AIR CLEANER ---------------------------------------------------------- 5-15

5

5. FUEL SYSTEM

5-1

MX’er 50

5. FUEL SYSTEM

5-2

MX’er 50

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

MX’er 50

Venturi dia.

14mm

Identification number

PB

Float level

16.3mm

Main jet

#78

Slow jet

#40

Air screw opening

2 ± _

Idle speed

2000±100rpm

Throttle grip free play

1_ 4mm

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

5. FUEL SYSTEM

5-3

MX’er 50

THROTTLE VALVE DISASSEMBLY/CARBURETOR REMOVAL

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

5. FUEL SYSTEM

5-4

MX’er 50

Remove the jet needle by removing the needle clip. Check the jet needle and throttle valve for wear or damage.

THROTTLE VALVE INSTALLA-TION

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.

Needle Retainer 2nd Notch (STD)

Throttle Valve

Jet Needle

Needle Clip

Carburetor Cap

Rubber Seal

Throttle Valve Spring

Throttle Valve Throttle Cable