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KYMCO NEXXON 50 Service Manual

KYMCO NEXXON 50
193 pages
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NEXXON 50
PREFACE
This Service Manual describes the
technical features and servicing
procedures for the KYMCO NEXXON
50.
Section 1 contains the precautions for all
operations stated in this manual. Read
them carefully before starting any
operation.
Section 2 is the inspection/ adjustment
procedures, safety rules and service
information for each part, starting from
periodic maintenance.
Sections 3 and 4 state the servicing
procedures and cautions for the removal
and installation of lubrication and fuel
systems.
Sections 5 through 18 give instructions
for disassembly, assembly and inspection
of engine, chassis frame and electrical
equipment.
Most sections start with an assembly or
system illustration and troubleshooting
for the section. The subsequent pages
give detailed procedures for the section.
KWANG YANG MOTOR CO., LTD.
OVERSEAS SALES DEPARTMENT
OVERSEAS SERVICE SECTION
TABLE OF CONTENTS
GENERAL INFORMATION 1
INSPECTION/ADJUSTMENT 2
LUBRICATION SYSTEM 3
FUEL SYSTEM 4
ENGINE REMOVAL/INSTALLATION 5
CYLINDER HEAD/VALVES 6
CYLINDER/PISTON 7
ALTERANTOR/CAM CHAIN
TENSIONER
8
CLUTCH/GEAR SHIFT MECHANISM 9
ENGINE
CRANKCASE/CRANKSHAFT/KICK
STARTER/TRANSMISSION
10
FRONT WHEEL/SUSPENSION/
STEERING
11
REAR WHEEL/BRAKE/SUSPENSION 12
HYDRAULIC BRAKE 13
CHASSIS
FRAME COVER
14
IGNITION SYSTEM 15
CHARGING SYSTEM 16
STARTING SYSTEM 17
LIGHTS/INSTRUMENTS/SWITCHES
/
HORN/FUEL UNIT
18
ELECTRICAL
EQUIPMENT
EXHAUST EMISSION CONTROL
SYSTEM
19
Our company reserves right to make
any alteration in the design
. The
information and contents included in
this manual may be different from the
motorcycle in case specifications are
changed.

Table of Contents

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KYMCO NEXXON 50 Specifications

General IconGeneral
Engine TypeSingle-cylinder, 4-stroke
Displacement49.5 cc
Fuel SystemCarburetor
Brakes (Front)Disc
Brakes (Rear)Drum
Front SuspensionTelescopic Fork
Front Tire120/70-12
Rear Tire130/70-12
StarterElectric & Kick
TransmissionCVT
Engine4-Stroke

Summary

Preface

1. General Information

Engine Serial Number

Location of engine and frame serial numbers.

Specifications

Technical specifications of the motorcycle.

Service Precautions

Important safety and service guidelines.

Torque Values

Specified torque values for fasteners.

Special Tools

List of specialized tools required for service.

Lubrication Points

Diagram showing lubrication points on the motorcycle.

Cable & Harness Routing

Visual guide for routing cables and harnesses.

Wiring Diagram

Electrical wiring schematic for the motorcycle.

Troubleshooting

Common problems and their solutions for engine starting.

2. Inspection/Adjustment

Service Information

General safety and specification details.

Maintenance Schedule

Periodic maintenance schedule based on mileage.

Fuel Line/Filter

Procedures for checking and servicing the fuel line and filter.

Throttle Operation

Checking and adjusting throttle grip free play.

Choke

Checking choke lever operation.

Air Cleaner

Procedures for replacing and cleaning the air cleaner element.

Spark Plug

Inspection, cleaning, and gap measurement of the spark plug.

Valve Clearance

Inspecting and adjusting valve clearance.

Carburetor Idle Speed

Adjusting the idle speed of the carburetor.

Ignition Timing

Checking and verifying ignition timing.

Cylinder Compression

Measuring cylinder compression pressure.

Engine Oil

Checking and changing engine oil level and capacity.

Drive Chain

Checking and adjusting drive chain slack.

Brake Shoe

Inspecting front brake linings for wear.

Brake Lever/Pedal

Measuring rear brake pedal free play.

Clutch

Adjusting clutch operation.

Brake Fluid

Checking brake fluid level.

Suspension

Inspecting front and rear suspension components.

Nuts/Bolts/Fasteners

Checking chassis nuts and bolts for looseness.

Wheels/Tires

Checking tires for damage and tire pressure.

Steering Handlebar

Checking control cables and handlebar rotation.

3. Lubrication System

Service Information

General instructions and specifications for lubrication.

Troubleshooting

Troubleshooting common lubrication issues.

Engine Oil/Oil Filter

Procedures for checking oil level, changing oil, and filter.

Oil Pump/Oil Filter Rotor

Removal, disassembly, and inspection of oil pump and rotor.

4. Fuel System

Service Information

General safety and specifications for the fuel system.

Troubleshooting

Common fuel system problems and solutions.

Air Cleaner Removal

Steps to remove the air cleaner case and element.

Throttle Valve Disassembly

Disassembling the throttle valve and its components.

Throttle Valve Installation

Reassembling and installing the throttle valve.

Carburetor Removal

Procedures for removing the carburetor from the engine.

5. Engine Removal/Installation

Service Information

General instructions, oil capacity, and torque values.

Engine Removal

Step-by-step guide for removing the engine.

Engine Installation

Step-by-step guide for installing the engine.

6. Cylinder Head/Valves

Schematic Drawing

Exploded view of cylinder head and valve components.

Service Information

General instructions, specifications, and torque values.

Troubleshooting

Diagnosing cylinder head and valve issues.

Cylinder Head Removal

Procedures for removing the cylinder head.

Cylinder Head Disassembly

Disassembling the cylinder head components.

Cylinder Head Assembly

Reassembling the cylinder head and valves.

Cylinder Head Installation

Installing the cylinder head back onto the engine.

7. Cylinder/Piston

Schematic Drawing

Exploded view of cylinder and piston parts.

Service Information

General instructions and specifications for cylinder/piston.

Troubleshooting

Diagnosing cylinder and piston related problems.

Cylinder Removal

Steps to remove the cylinder from the engine.

Piston Removal

Procedures for removing the piston from the cylinder.

Piston Installation

Installing the piston and rings into the cylinder.

Cylinder Installation

Installing the cylinder onto the engine.

8. Alternator/Starter Clutch/Cam Chain Tensioner

Service Information

General instructions, specifications, and torque values.

Troubleshooting

Diagnosing issues with starting system and engine noise.

Alternator Removal

Step-by-step guide for removing the alternator.

Starter Clutch Removal

Procedures for removing the starter clutch.

Cam Chain Tensioner

Removal and inspection of the cam chain tensioner.

Tensioner Spring and Push Rod

Inspecting the tensioner spring and push rod.

Starter Clutch Installation

Installing the starter clutch assembly.

9. Clutch/Gear Shift Mechanism

Service Information

General instructions and specifications for clutch/gear shift.

Troubleshooting

Diagnosing clutch and gear shift problems.

Right Crankcase Cover Removal

Removing the right crankcase cover.

Clutch Lifter Removal/Inspection

Removing and inspecting the clutch lifter.

Centrifugal Clutch/Manual Clutch Removal

Removing the centrifugal and manual clutch assemblies.

Manual Clutch Disassembly

Disassembling the manual clutch components.

Inspection Clutch Gear O.D/I.D

Inspecting clutch gear dimensions.

Clutch Tension Spring

Measuring clutch spring dimensions.

Clutch Friction Disk

Measuring clutch friction disk thickness.

Gear Shift Mechanism

Procedures for the gear shift mechanism.

Right Crankcase Cover Installation

Installing the right crankcase cover.

10. Crankcase/Crankshaft/Kick Starter/Transmission

Service Information

General instructions and specifications.

Troubleshooting

Diagnosing noise and shifting issues.

Crankcase Removal

Steps for removing the crankcase halves.

Crankshaft/Kick Starter Removal

Removing the crankshaft and kick starter spindle.

Crankshaft Inspection

Measuring crankshaft clearances and runout.

Kick Starter Disassembly

Disassembling the kick starter mechanism.

Transmission Disassembly

Removing transmission components.

Inspection

Inspecting transmission gears and shafts.

Transmission Fork/Drum Inspection

Inspecting transmission forks and drum.

Transmission Bearing Inspection

Checking transmission bearings for wear.

Assembly

Assembling transmission components.

Crankcase Bearing Replacement

Replacing crankcase bearings.

Left Crankcase

Procedures for the left crankcase.

Right Crankcase

Procedures for the right crankcase.

Crankcase Installation

Installing the crankcase halves.

11. Front Wheel/Suspension/Steering

Service Information

General instructions, specifications, and torque values.

Troubleshooting

Diagnosing steering and suspension issues.

Handlebar

Removal and installation of the handlebar.

Front Wheel

Removal, inspection, and disassembly of the front wheel.

Front Shock Absorber

Removal, disassembly, and inspection of front shock absorbers.

Steering Stem

Removal, inspection, and replacement of steering stem components.

12. Rear Wheel/Brake/Suspension

Service Information

General instructions, specifications, and torque values.

Troubleshooting

Diagnosing wheel, brake, and suspension problems.

Rear Wheel

Removal, inspection, and disassembly of the rear wheel.

Rear Brake

Removal and inspection of the rear brake components.

Rear Shock Absorber

Removal and installation of rear shock absorbers.

Rear Fork

Removal and installation of the rear fork.

13. Hydraulic Brake

Service Information

General instructions, specifications, and torque values.

Troubleshooting

Diagnosing hydraulic brake issues.

Brake Fluid Change/Air Bleed

Procedures for changing brake fluid and bleeding the system.

Brake Pad/Disk

Replacement of brake pads.

Brake Master Cylinder

Removal, disassembly, and inspection of the master cylinder.

Brake Caliper

Removal, disassembly, and inspection of the brake caliper.

14. Frame Cover

Service Information

General instructions and torque values for frame covers.

Frame Covers

Procedures for removing and installing various frame covers.

Handlebar Front/Rear Cover Removal

Removing handlebar front and rear covers.

Met-in Box Removal

Removing the met-in box and battery cover.

Frame Body Cover Removal

Removing center and side molding covers.

Rear Fender Removal

Removing the rear fender assembly.

Leg Shield Removal

Removing front center and leg shield covers.

Front Fender Removal

Removing front fender sections.

Exhaust Muffler Removal

Removing the exhaust muffler.

15. Ignition System

Service Information

General instructions, specifications, and testing instruments.

Troubleshooting

Diagnosing ignition system problems.

Ignition Coil

Continuity test for the ignition coil.

CDI Unit

Inspection and resistance testing of the CDI unit.

Exciter Coil/Pulser Coil Inspection

Resistance testing of exciter and pulser coils.

16. Charging System

Service Information

General instructions, specifications, and torque values.

Troubleshooting

Diagnosing charging system issues.

Battery

Battery removal, voltage inspection, and charging procedures.

Performance Test

Testing charging system performance.

A.C. Generator Inspection

Measuring AC generator resistance.

Regulator/Rectifier Removal

Removing and testing the regulator/rectifier.

17. Starting System

Service Information

General instructions and specifications for the starting system.

Troubleshooting

Diagnosing starter motor and engine starting issues.

Starter Motor Removal

Steps for removing the starter motor.

Starter Motor Inspection

Inspecting commutator bars, bearings, and brushes.

Starter Relay Inspection

Testing the starter relay for continuity.

18. Lights/Instruments/Switches/Horn/ Fuel Unit

Service Information

General instructions and specifications for electrical components.

Troubleshooting

Diagnosing lighting and instrument issues.

Headlight

Removing and installing the headlight unit.

Instrument Bulbs Replacement

Replacing instrument panel bulbs.

Speedometer Removal

Removing the speedometer assembly.

Turn Signal Light

Removing and replacing turn signal bulbs.

Stop Light/Taillight

Removing and replacing stop/tail light bulbs.

Ignition Switch

Removing and inspecting the ignition switch.

Starter Button

Checking continuity of the starter button.

Horn Button

Checking continuity of the horn button.

Horn

Testing the horn functionality.

Handlebar Switches

Checking continuity of handlebar switches.

Dimmer Switch

Checking continuity of the dimmer switch.

Fuel Unit

Inspecting and installing the fuel unit.

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