1976-1979 Yamaha XS500 Service & Repair Manual (P/N 90890-01081)

• Covers 1976–1979 Yamaha XS500 DOHC parallel twin motorcycles, documenting technical specifications for engine, chassis, and electrical systems
• Official Yamaha service publication 90890-010810, multilingual edition including English, French, and German sections
• Contains 47 exploded-view diagrams and 3 complete electrical schematics for the ignition, lighting, and charging systems
• Provides essential component data for period-correct maintenance, part verification, and repair planning

System Documentation and Overhaul Data

This manual delivers structured technical data for maintaining the DOHC parallel twin platform. Chapters span from general machine identification to deep-dives into the wet sump lubrication system, constant-vacuum carburetors, and the five-speed transmission. When working on vintage motorcycles, always verify local workshop safety standards and ensure the machine is securely mounted before beginning any inspection to prevent accidental tipping. The text details the vibration-balancing mechanism alongside the high-performance valve train layout. This supports long-term upkeep for this classic Japanese motorcycle without relying on guesswork.

Factory Specifications

Engine timing data and carburetor synchronization specs are thoroughly documented. This helps you evaluate performance accurately. During engine assembly, the cylinder head bolt torque is specified at 3.5–4.0 m-kg. Check the valve specification table for the exact intake valve clearance, listed at 0.15–0.20 mm. The standard suspension setup dictates a front fork oil capacity of 165 ±3 cc per side. Electrical system reference values include a no-load voltage rating of 14.5V ±0.3V for the Hitachi regulator. Reviewing these precise factory figures ensures your repair components meet original tolerances before final assembly.