1986 Yamaha YZ125S Service Manual
Service manual for Yamaha YZ125S models, covering engine, chassis, electrical, and maintenance procedures. Publication LIT-11626-05-13.
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Models Covered & Key Technical Specifications
Unified Reference Shop Manual: Yamaha YZ125S (LIT-11626-05-13) 1986 Service Manual | Edition
- Established Throughput Data: 25 ppm establishes the maximum print output Architecture.
- Operational Angular Speed: For optimal function, 11,000 rpm defines the engine speed Framework.
- Essential Package Size: 1.6 L -- signifies the active fuel tank capacity Threshold.
- Baseline Moment Values: The transmission requires 8.1 - 10.5 : 1 for standard operation Logic.
- Integral Fit Tolerances: Wheelbase reaches 1,450 mm Parameters.
- Specific Speed Rating: The engine oil grade is specified as Yamalube "R" Norms.
Professional Workshop Service Manual & Technical Specifications
Unified Reference Shop Manual: Yamaha YZ125S (LIT-11626-05-13) : DL this manual (1986) Troubleshooting-Index
Engine-Type: Motorcycle // Model-Designation: YZ125S / Yamaha Motor Corp., Ltd // Engine-Type: 2-stroke Logic.
Document Overview
| Integrated-Framework | Diagnostic-Logic | Logic |
|---|---|---|
| General Information | Engine Maintenance and Repair | Maintenance Intervals |
| Periodic Inspection and Adjustment | Chassis Maintenance and Repair | Lubrication |
| Electrical | Appendices | Technical Documentation |
Repair data is categorized into sections covering general information, periodic maintenance and adjustments, engine repair, chassis repair, electrical systems, and appendices. This manual details various systems and procedures, including engine operation descriptions, assembly instructions for key components, and hydraulic schematics where applicable. It documents torque specifications for critical engine components to ensure proper dynamic load distribution.
System operation descriptions cover:
Engine components, fuel systems, and ignition timing.
The documentation addresses:
Carburetor assembly, maintenance, and adjustments, including pilot air screw and jet needle settings.
Assembly instructions are detailed for:
Crankcase, cylinder, and piston ring assembly, ensuring correct alignment and torque values.
Hydraulic schematics are included for:
Front and rear brake systems, including caliper and master cylinder disassembly.
Steering component information is provided for:
Steering head bearing inspection and adjustment, along with front fork servicing.
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