Yamaha YSR50T 1987 Service Manual – Repair & Wiring Diagram PDF

Description

Yamaha YSR50T 1987 Service Manual – Repair & Wiring Diagram PDF DOWNLOAD

Description

If you’re restoring or repairing a classic YSR50T, this workshop manual gives you the correct service procedures, specifications, and diagnostics used by technicians. It’s organized by chapter with clear maintenance routines, teardown/rebuild steps, and electrical troubleshooting—so you can fix issues confidently and correctly.

✅ Model Covered

• YSR50T (Service Manual, 1st Edition – March 1987)

📑 Table of Contents

CHAPTER 1 — General Information

• Motorcycle identification

  • Vehicle identification number (VIN)

  • Engine serial number

• Important information

  • Preparation for removal and disassembly

  • Replacement parts

  • Gaskets, oil seals, O-rings

  • Lock washers/plates and cotter pins

  • Bearings and oil seals

  • Circlips

• Special tools

  • For tune-up

  • For engine service

  • For chassis service

  • For electrical components

CHAPTER 2 — Specifications

• General specifications

• Maintenance specifications

  • Engine

  • Chassis

  • Electrical

• General torque specifications

• Definition of units

• Lubrication points and lubricant type

  • Engine

  • Chassis

• Cable routing

CHAPTER 3 — Periodic Inspection and Adjustment

• Introduction

• Periodic maintenance / lubrication intervals

• Cowlings removal and installation

• Side cover

• Engine adjustments & checks

  • Idle speed adjustment

  • Throttle cable free play adjustment

  • Autolube pump cable adjustment

  • Autolube pump stroke adjustment

  • Autolube pump air bleeding

  • Spark plug inspection

  • Ignition timing check

  • Engine oil level check

  • Transmission oil level inspection / replacement

  • Clutch adjustment

  • Air filter cleaning

  • Carburetor joint inspection

  • Fuel line inspection

  • Y.E.I.S. hose inspection

  • Exhaust system inspection

• Chassis checks/adjustments

  • Front brake adjustment

  • Rear brake adjustment

  • Brake fluid inspection

  • Brake pad / brake shoe inspection

  • Brake light switch adjustment

  • Brake hose inspection

  • Drive chain slack adjustment / lubrication

  • Steering head adjustment

  • Tire inspection

  • Wheel inspection

  • Cable inspection & lubrication

  • Lever/pedal lubrication

  • Sidestand lubrication

• Electrical checks

  • Battery inspection

  • Fuse inspection

  • Headlight beam adjustment

  • Headlight replacement

CHAPTER 4 — Engine Overhaul

• Engine removal

  • Transmission oil / cowling & side cover / fuel tank / muffler / carburetor

  • Autolube pump cable and hose / leads / clutch cable / drive chain

• Engine disassembly

  • Cylinder head, cylinder and piston

  • Clutch and primary drive gear

  • Kick axle / shift shaft / CDI magneto

  • Crankcase

  • Transmission, shifter and crankshaft

• Inspection and repair

  • Cylinder head / cylinder & piston / piston rings / piston pin & bearing

  • Clutch

  • Shift shaft

  • Transmission and shifter

  • Crankshaft / crankcase

  • Autolube pump

• Engine assembly and adjustment

  • Crankshaft, shifter and transmission

  • Crankcase

  • CDI magneto

  • Shift shaft

  • Kick axle

  • Clutch and primary drive gear

  • Cylinder head, cylinder and piston

• Remounting engine

CHAPTER 5 — Carburetion

• Carburetor

  • Removal / disassembly / inspection / assembly / installation / adjustment

• Reed valve

  • Removal / inspection / installation

CHAPTER 6 — Chassis

• Front wheel (removal / inspection / installation)

• Rear wheel (removal / inspection / installation)

• Front brake

  • Brake pad replacement

  • Caliper disassembly

  • Master cylinder disassembly

  • Inspection and repair

  • Assembly / air bleeding

• Front fork (removal / disassembly / inspection / assembly / installation)

• Steering head and handlebar (removal / inspection / installation)

• Rear shock absorber and swingarm (removal / disassembly / inspection / assembly / installation)

• Drive chain and sprockets (removal / inspection / installation)

CHAPTER 7 — Electrical

• Circuit diagram / color code

• Electrical components

• Ignition and starting system

• Ignition control circuit operation + troubleshooting

• Charging system + troubleshooting

• Lighting system + troubleshooting

• Signal system + troubleshooting

• Display system + troubleshooting

• Display system test and check

CHAPTER 8 — Troubleshooting

• Starting failure / hard starting

• Poor idle speed performance

• Poor medium & high speed performance

• Faulty gear shifting (hard shifting / pedal issues / jump-out gear)

• Clutch slipping / dragging

• Improper kicking (slipping / hard kicking / kick crank not returning)

• Faulty brake / poor braking effect

• Front fork oil leakage & malfunction

• Unstable handling

• Faulty signal & lighting system (headlight dark, bulbs, flasher issues, horn)

• Overheating

• Wiring diagram reference

📌 File Details (for customers)

Bring your YSR50T back to perfect running condition with the correct factory procedures and specs. Download instantly and start diagnosing, rebuilding, and repairing with confidence today.