Yamaha RD500LC 1984 Factory Service Manual (P/N 47X-28197-80)

This Yamaha factory service manual covers the 1984 Yamaha RD500LC (47X), with engine and frame numbering starting at 47X-000101. The Yamaha manual number is P/N 47X-28197-80.

Chapter Bookmarks and Wiring Diagram Readability

Finding chapters and reading schematics: Eight embedded bookmarks open the main chapters. The PDF has no text search. Zoom in to read small component numbers and wire color codes, especially in the shaded areas of the circuit views.

The ZIP download contains one printable PDF with 260 pages, including the original cover, four introductory pages, and the 23-page appendix. The workshop procedures are in English, with French and German legends in the electrical chapter.

V4 Overhaul, Chassis Service, and Electrical Diagnosis

These are selected workshop topics. The manual also covers cowling removal and headlight aiming.

• Periodic maintenance: Service and lubrication schedules, ignition timing checks, and Yamaha Autolube pump adjustment and bleeding.
• V4 engine overhaul: Engine removal and installation, plus disassembly, inspection, and reassembly of the cylinder groups, crankcases, crankshafts, clutch, and transmission.
• Cooling and carburetion: Coolant replacement, water-pump and thermostat service, carburetor overhaul, and synchronization.
• Chassis service: Wheel and tire service, chain and sprocket inspection, hydraulic brake bleeding, front-fork and anti-dive service, and steering-head work.
• Electrical fault tracing: Main wiring diagram, circuit views, and troubleshooting charts for ignition and starting, charging, lighting, signals, the cooling fan, and YPVS.
• Workshop references: Yamaha special-tool numbers, torque specifications, inspection limits, lubrication diagrams, and cable-routing views.

Yamaha wrote the manual primarily for its dealers and qualified mechanics, assuming a working knowledge of motorcycle repair.

Engine and Drivetrain Repair

Separate exploded views and assembly notes distinguish the upper and lower cylinder groups, including their pistons, reed valves, water jackets, YPVS hardware, and crankshafts. That layout helps match components to the correct bank during teardown and reassembly.

The six-speed gearbox coverage includes the shift forks and shift cam. Related sections cover the primary drive, kick-start mechanism, and transmission oil pump. The crankcase assembly notes identify the locating grooves for the bearing clips and the oil and blind seal flanges.

Cooling and Carburetor Adjustments

The cooling chapter maps coolant flow and separates radiator-cap testing from cooling-system leak checks. Sectional views of the Mikuni VM26SS carburetors accompany float-height and fuel-level adjustments. The maintenance chapter also covers throttle-cable adjustment.

Brakes and Rear Suspension

The cast-wheel and tubeless-tire sections cover wheel-bearing inspection and wheel balancing. The brake chapter details pad replacement and front and rear caliper and master-cylinder overhaul. The fork service instructions warn that oil on brake components can reduce braking and damage rubber parts.

New Monocross coverage includes swingarm and relay-arm free-play checks and bearing inspection. The manual covers removal, inspection, and adjustment of the nitrogen-charged rear shock. Yamaha specifies replacement for a damaged or leaking shock.

Circuit Tests and Workshop Tools

Component checks cover the ignition, pickup, and source coils, spark-plug caps, generator output, stator, and rectifier. The cooling and YPVS sections add tests for the temperature sender, fan motor, YPVS control unit, and servomotor. Market notes identify differences for England, Germany, and Finland. The main wiring diagram has a Germany-specific inset, and the self-canceling flasher checks exclude German-spec machines.

The tool list identifies the flywheel magneto puller 90890-01362 and its adapter 90890-04063, the universal clutch holder 90890-04086, and the piston-pin puller 90890-01304. It also lists the front-fork damper-rod holder 90890-01388 and the electro tester 90890-03021. The appendix contains three lubrication diagrams and five cable-routing views.

Sample Engine Clearances and Radiator Cap Test Data

The piston inspection specifies a piston-to-cylinder clearance of 0.060–0.065 mm and a service limit of 0.10 mm. The crankshaft inspection gives a 0.03 mm runout limit for the dial-indicator check.

For the radiator cap, Yamaha specifies a valve opening pressure of 78–98 kPa. The manual treats that check separately from the cooling-system leak test.