1980 Yamaha XS850, XS850G, XS850SG Service & Repair Manual (P/N YM-00197-70)

• Covers the XS850G and XS850SG, detailing factory specifications for maintenance, engine overhauls, and general repair reference.
• Official Yamaha publication P/N 3U8-28197-70, issued for the 1980 model year.
• Contains 47 detailed exploded-view diagrams of the engine, transmission, and chassis components to support daily workshop tasks.
• Provides the baseline factory parameters for the 3U8 and 3V0 serial number series, documenting the unique air-suspension and clutch-damper configurations essential for an accurate rebuild.

Technical Structure and Contents

The 1980 Yamaha XS850 service manual provides a structured look into vehicle identification, periodic inspection, and engine maintenance. Inside, professionals and enthusiasts will find comprehensive chapters on general maintenance intervals, lubrication schedules, and descriptive overviews of the cylinder head, pistons, clutch, and transmission assemblies. Special tools are clearly identified throughout to support accurate component removal and reassembly. Before beginning any major repair work, mechanics should always verify their specific model variations and observe standard workshop safety protocols, as handling heavy engine components and high-pressure fluids carries inherent risks. This reference material is designed to streamline your workflow by offering clear, OEM-level insights rather than step-by-step DIY tutorials.

Specification Highlights

Factory values for engine performance and chassis settings are meticulously documented throughout the reference sections to ensure accuracy. For instance, the intake valve clearance is listed at 0.11–0.15 mm. Because this model utilizes an air-cooled engine configuration, coolant system capacity data is obviously excluded. You will also find the standard compression pressure for the triple-cylinder engine documented at 11 bar (156 psi) at sea level. Having these precise numbers readily available helps technicians quickly verify tolerances during diagnostic tear-downs.