The 1986 Yamaha YZ125 is a highly capable motocross competition motorcycle renowned for its lightweight chassis, potent two-stroke engine, and agile handling. As part of Yamaha's esteemed YZ lineage, this model embodies a commitment to performance and innovation in the powersports industry. Engineered for enthusiasts, mechanics, and race teams, the YZ125 was a strong contender against competitors like the Honda CR125R, Suzuki RM125, and Kawasaki KX125 of its time. Its design prioritizes responsiveness and rider control, making it a formidable machine on the motocross track.

This comprehensive Factory Service Manual serves as an essential resource for the maintenance, repair, and optimization of your 1986 Yamaha YZ125. It covers a wide array of critical systems, including complete engine overhaul, fuel system tuning, ignition, transmission, suspension, braking, and electrical systems, along with detailed procedures for routine maintenance and component rebuilding. The manual provides step-by-step repair guides, diagnostic procedures for common issues, and precise technical specifications, empowering owners and technicians to ensure the longevity and peak performance of this iconic motocross bike.

The 1986 Yamaha YZ125 is a highly capable motocross competition motorcycle renowned for its lightweight chassis, potent two-stroke engine, and agile handling. As part of Yamaha's esteemed YZ lineage, this model embodies a commitment to performance and innovation in the powersports industry. Engineered for enthusiasts, mechanics, and race teams, the YZ125 was a strong contender against competitors like the Honda CR125R, Suzuki RM125, and Kawasaki KX125 of its time. Its design prioritizes responsiveness and rider control, making it a formidable machine on the motocross track.

This comprehensive Factory Service Manual serves as an essential resource for the maintenance, repair, and optimization of your 1986 Yamaha YZ125. It covers a wide array of critical systems, including complete engine overhaul, fuel system tuning, ignition, transmission, suspension, braking, and electrical systems, along with detailed procedures for routine maintenance and component rebuilding. The manual provides step-by-step repair guides, diagnostic procedures for common issues, and precise technical specifications, empowering owners and technicians to ensure the longevity and peak performance of this iconic motocross bike.