1986-1990 Yamaha BW80S Service Manual

Yamaha BW80S 1986–1990 Service Manual Documentation

• Covers the 1986–1990 Yamaha BW80S off-road motorbike, documenting engine, chassis, carburetion, and electrical systems for this iconic Big Wheel model
• Official Yamaha publication LIT-11616-05-23, first edition dated August 1985
• Includes 64 exploded-view component diagrams and 15 dedicated specification tables for wear limits, clearances, and torque settings
• Accessible from your device as soon as the order is placed
• Indexed PDF search covers every chapter and appendix
• Re-download the file any time, no expiration
• Suitable for printing individual sections for shop-floor use
• This 1985 first edition serves as the original baseline specification reference for the entire 1986–1990 production run of the BW80S

Manual Content Coverage

The 1986–1990 Yamaha BW80S service manual serves as the primary technical publication for maintenance and overhaul operations. Organized into seven core chapters, the documentation details general machine identification, routine periodic inspection schedules, and comprehensive engine disassembly procedures. Specialized sections cover the intricacies of the Autolube pump system, clutch assembly, and transmission. Further chapters detail front fork service, steering head maintenance, and wheel component care. Each disassembly section features exploded diagrams to identify parts and assembly orientation.

Technical Data Preview

Reference tables throughout this publication provide precise limits for engine and chassis tolerances. Cylinder bore standard dimensions are documented at 47.00–47.02 mm. Piston ring side clearance is specified at 0.03–0.05 mm. The manual includes a comprehensive workshop guide for understanding maintenance intervals. Front fork oil capacity for each leg is listed at 69 cm³. Steering head ring nut torque is specified at 38 Nm. Rear wheel axle nut torque is 85 Nm. Always consult a certified technician before performing service on this equipment.

An official 100-page Yamaha OEM workshop manual covering the 1986–1990 BW80S, documenting engine, chassis, electrical, and carburetion specifications for the 1RY-series build.