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Honda NX250 User Manual

Honda NX250
269 pages
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Table of Contents

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Honda NX250 Specifications

General IconGeneral
Displacement249 cc
Bore x Stroke70.0 mm x 64.8 mm
Compression Ratio11.0:1
Transmission6-speed
Front SuspensionTelescopic fork
Front BrakeSingle disc
Rear BrakeDrum
InductionCarburetor
IgnitionCDI
Tires Front3.00-21
Fuel SystemCarburetor
StarterElectric
Final DriveChain
Engine TypeSingle cylinder, four-stroke
Rear SuspensionPro-Link single shock
Rear Suspension AlternativePro-Link
Tires Rear4.60-17

Summary

General Information

General Safety Precautions

Important safety warnings and precautions for operating and servicing the motorcycle.

Torque Values

Essential torque specifications for engine and frame fasteners for proper assembly.

Lubrication System Maintenance

Lubrication Troubleshooting

Common issues related to engine oil level, pressure, and lubrication.

Engine Oil and Filter Change

Detailed steps for changing the engine oil and replacing the oil filter.

General Maintenance Procedures

Maintenance Schedule

Recommended maintenance tasks based on mileage and time intervals.

Valve Clearance Adjustment

Procedures for measuring and adjusting valve clearances.

Brake System Checks

Procedures for inspecting brake shoe/pad wear and brake system components.

Fuel System Maintenance

Fuel System Troubleshooting

Common fuel system problems and their probable causes.

Fuel Tank Removal and Installation

Step-by-step instructions for removing and installing the fuel tank.

Carburetor Removal

Detailed instructions for removing the carburetor from the motorcycle.

Carburetor Disassembly

Step-by-step process for disassembling the carburetor components.

Carburetor Assembly

Instructions for assembling the carburetor, including jets and float valve.

Carburetor Installation

Procedures for installing the carburetor, including cable routing and adjustments.

Cooling System Maintenance

Cooling System Troubleshooting

Common cooling system problems and their probable causes.

System Testing Procedures

Methods for testing the coolant and radiator cap.

Coolant Replacement

Step-by-step guide for replacing the engine coolant.

Water Pump Service

Details on water pump mechanical seal inspection and replacement.

Engine Removal and Installation

Engine Removal Steps

Step-by-step instructions for removing the engine and associated components.

Engine Installation Steps

Instructions for installing the engine, including alignment and torque values.

Clutch System Maintenance

Clutch Troubleshooting

Common clutch operation issues and their probable causes.

Right Crankcase Cover Removal

Step-by-step instructions for removing the right crankcase cover.

Clutch Component Removal

Instructions for removing clutch components like bolts, springs, and plates.

Right Crankcase Cover Installation

Step-by-step instructions for installing the right crankcase cover.

Alternator and Starter Clutch Maintenance

Alternator/Starter Clutch Troubleshooting

Lists common issues and probable causes for the alternator and starter clutch.

Left Crankcase Cover Removal

Step-by-step instructions for removing the left crankcase cover.

Starter Clutch Installation

Instructions for installing the starter clutch and flywheel assembly.

Left Crankcase Cover Installation

Step-by-step instructions for installing the left crankcase cover.

Cylinder Head and Valve Service

Cylinder Head/Valve Troubleshooting

Common cylinder head and valve issues and their probable causes.

Cylinder Head Cover Removal

Step-by-step instructions for removing the cylinder head cover.

Camshaft and Cam Chain Tensioner Removal

Procedures for removing camshafts and the cam chain tensioner.

Cylinder Head Removal

Step-by-step instructions for removing the cylinder head.

Cylinder Head Disassembly

Detailed process for disassembling the cylinder head.

Valve Guide Replacement

Instructions for replacing valve guides.

Valve Seat Inspection and Refacing

Procedures for inspecting and refacing valve seats.

Cylinder Head Assembly

Instructions for assembling the cylinder head, including valve installation.

Cylinder Head Installation

Steps for installing the cylinder head onto the engine.

Camshaft and Cam Chain Tensioner Installation

Instructions for installing camshafts and the cam chain tensioner.

Cylinder and Piston Service

Cylinder Troubleshooting

Common cylinder and piston issues and their probable causes.

Cylinder Removal and Inspection

Procedures for removing and inspecting the cylinder for warpage and wear.

Piston and Piston Ring Inspection

Instructions for inspecting pistons and piston rings for wear.

Piston Ring Installation

Step-by-step instructions for installing piston rings onto the piston.

Piston and Cylinder Installation

Instructions for installing the piston and cylinder assembly.

Crankshaft and Transmission Service

Front Wheel, Suspension, and Steering Service

Rear Wheel, Brake, and Suspension Service

Hydraulic Brake System Service

Brake Fluid Replacement and Bleeding

Step-by-step instructions for draining, filling, and bleeding the brake system.

Battery and Charging System Service

Ignition System Service

Electric Starter System Service

Lights, Meters, and Switches Service

Wiring Diagram

Complete Wiring Diagram

Comprehensive wiring diagram for the motorcycle's electrical system.

General Troubleshooting Guide

Engine Does Not Start or Is Hard to Start

Guide to diagnosing and fixing engine starting problems.

Engine Lacks Power

Guide to diagnosing and fixing engine power loss issues.

Poor Performance at Low and Idle Speeds

Guide to diagnosing and fixing poor performance at low and idle speeds.

Poor Performance at High Speed

Guide to diagnosing and fixing poor performance at high speeds.

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