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Yamaha SR400 2014 User Manual

Yamaha SR400 2014
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2014
SERVICE MANUAL
SR400
SR400E
2RD-28197-E0

Table of Contents

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Yamaha SR400 2014 Specifications

General IconGeneral
Engine TypeAir-cooled, 4-stroke, SOHC, 2-valve
Displacement399cc
Bore x Stroke87.0 x 62.7 mm
Compression Ratio8.5:1
Fuel SystemFuel Injection
Transmission5-speed
Final DriveChain
Front SuspensionTelescopic fork
Rear SuspensionSwingarm
Front BrakeSingle disc
Rear BrakeDrum
Front Tire90/100-18M/C 54S
Rear Tire110/90-18M/C 61S
Ignition SystemTCI
Fuel Tank Capacity12 liters
Curb Weight174 kg
Wheelbase1, 410 mm
Length2, 085 mm
Width750 mm

Summary

General Information

Identification

Details about vehicle identification numbers and model labels.

Features

Overview of the Fuel Injection (FI) system and its components.

Important Information

Guidelines for preparation, parts replacement, and handling of specific components.

Basic Service Information

Information on handling quick fasteners and electrical systems.

Special Tools

List of specialized tools required for tune-up and assembly.

Specifications

General Specifications

Overall dimensions, weight, and load capacity of the vehicle.

Engine Specifications

Detailed technical specifications for the engine, including bore, stroke, and oil capacity.

Chassis Specifications

Technical details regarding the chassis, wheels, tires, and brakes.

Electrical Specifications

Specifications for the electrical system, including voltage, ignition, and battery details.

Tightening Torques

Specifies torque values for various fasteners used in engine and chassis assembly.

Lubrication Points and Lubricant Types

Identifies lubrication points and the recommended lubricants for engine and chassis parts.

Lubrication System Chart and Diagrams

Visual representation of the engine oil lubrication flow and system components.

Cable Routing

Diagrams illustrating the correct routing of wires, cables, and hoses on the vehicle.

Periodic Checks and Adjustments

Periodic Maintenance Overview

General information and recommended checks and adjustments for vehicle maintenance.

Introduction to Preventive Maintenance

Explains the importance of preventive maintenance for reliable operation and longevity.

Periodic Maintenance Chart for Emission Control System

Schedule of checks and maintenance for emission control system components.

General Maintenance and Lubrication Chart

Comprehensive chart of maintenance and lubrication tasks based on odometer reading.

Chassis

General Chassis Procedures

Procedures for removing and installing seat covers, battery, and electrical components.

Front Wheel Service

Steps for removing, disassembling, checking, and installing the front wheel assembly.

Rear Wheel Service

Procedures for removing, disassembling, checking, and installing the rear wheel and brake.

Front Brake System Service

Detailed procedures for servicing the front brake system, including pads, caliper, and master cylinder.

Rear Brake System Service

Steps for disassembling, checking, and assembling the rear brake shoe plate.

Handlebar and Controls Service

Procedures for removing, checking, and installing the handlebar and related controls.

Front Fork Service

Instructions for removing, disassembling, checking, and assembling the front fork legs.

Steering Head Service

Procedures for removing, checking, and installing the steering head components.

Rear Suspension and Swingarm Service

Steps for removing, checking, and installing the rear shock absorber and swingarm.

Chain Drive Maintenance

Procedures for removing, checking, installing, and adjusting the drive chain.

Engine Service

Engine Inspection and Compression Test

Procedures for measuring engine compression pressure and checking spark plug.

Engine Removal Procedure

Step-by-step guide for removing the engine from the vehicle.

Cylinder Head Service

Procedures for removing, checking, and installing the cylinder head and camshaft assembly.

Rocker Arm and Shaft Service

Steps for removing, checking, and installing rocker arms and shafts.

Valves and Valve Springs Service

Procedures for removing, checking, and installing valves, springs, and guides.

Cylinder and Piston Service

Steps for removing, checking, and installing the cylinder, piston, and rings.

Clutch System Service

Procedures for removing, checking, and installing clutch components.

Kickstarter System Service

Steps for removing, disassembling, and installing the kickstarter mechanism.

Oil Pump Service

Procedures for removing, checking, and assembling the oil pump.

Shift Shaft Service

Steps for removing, checking, and installing the shift shaft and stopper lever.

Generator Service

Procedures for removing and installing the stator coil and AC magneto.

Crankcase Service

Steps for separating, disassembling, checking, and assembling the crankcase.

Crankshaft Assembly Service

Procedures for removing, checking, and installing the crankshaft assembly.

Transmission Service

Steps for removing, disassembling, checking, and assembling the transmission, shift forks, and drum.

Fuel System

Fuel Tank Service

Procedures for removing and installing the fuel tank, fuel pump case, and associated hoses.

Throttle Body Service

Steps for removing, disassembling, checking, and adjusting the throttle body and sensors.

Air Induction System Service

Procedures for checking and installing the air induction and air cut-off valve systems.

Electrical System

Ignition System

Circuit diagram and troubleshooting for the ignition system, including spark plug and coil.

Charging System

Circuit diagram and troubleshooting for the charging system, including battery and stator.

Lighting System

Circuit diagram and troubleshooting for headlights, taillights, and indicators.

Signaling System

Circuit diagram and troubleshooting for turn signals, brake lights, and horn.

Fuel Injection System

Circuit diagram, ECU self-diagnostics, and troubleshooting for the FI system.

Fuel Pump System

Circuit diagram and troubleshooting for the fuel pump operation.

Electrical Components Inspection

Identification and checking procedures for various electrical components like switches, fuses, and sensors.

Troubleshooting

General Troubleshooting Information

General guidance for troubleshooting and referring to specific procedures in the manual.

Starting Failures Troubleshooting

Lists potential causes for engine starting problems related to engine, fuel, and electrical systems.

Incorrect Engine Idling Speed Troubleshooting

Lists potential causes for incorrect engine idling speed related to engine, fuel, and electrical systems.

Poor Medium and High Speed Performance Troubleshooting

Lists potential causes for poor engine performance at medium and high speeds.

Faulty Gear Shifting Troubleshooting

Lists potential causes for difficulties in shifting gears or the shift pedal not moving.

Shift Pedal Does Not Move Troubleshooting

Lists potential causes for a non-functional shift pedal.

Jumps Out of Gear Troubleshooting

Lists potential causes for the transmission jumping out of gear.

Faulty Clutch Troubleshooting

Lists potential causes for clutch slippage or dragging issues.

Overheating Troubleshooting

Lists potential causes for engine overheating related to engine, fuel, and chassis systems.

Poor Braking Performance Troubleshooting

Lists potential causes for inadequate braking performance in disc and drum brakes.

Faulty Front Fork Legs Troubleshooting

Lists potential causes for issues with the front fork legs, such as oil leaks or damage.

Unstable Handling Troubleshooting

Lists potential causes for unstable vehicle handling related to handlebar, steering, suspension, and frame.

Faulty Lighting or Signaling System Troubleshooting

Lists potential causes for failures in the lighting and signaling systems, including bulbs and wiring.

Wiring Diagram

Wiring Diagram Color Code

Provides a key for understanding the wire colors used in the wiring diagram.

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