1989-2007 Yamaha YFA1 / YFM125 Breeze ATV Service Manual
Covers YFA1, YFA1(C), YFM125S models with carburetor specs, ignition/charging system procedures, and complete brake/electrical troubleshooting. Reference: 3FA-28197-10 / 3FAW/3FAX.
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Sample pages from the 1989-2007 Yamaha YFA1 / YFM125 Breeze ATV Service Manual manual
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Models Covered & Key Technical Specifications
Yamaha YFM125S, YFA1P, YFA1PC Breeze 125 — 1989–2007 Mechanical Industrial Sourcebook | Breeze 125 Series Set.
- Authorized Fit Tolerances: The spark plug gap is specified as 0.6–0.7 mm (0.024–0.028 in) for optimal ignition Requirements.
- Critical Consumption Data: For fuel delivery, 7.6 L (1.67 Imp gal, 2.01 US gal) indicates the primary tank reserve Threshold.
- Operational Thermal Limits: Engine compression is configured at 9.0:1 pressure ratio Setting Mapping.
- Established Linear Velocity: The engine idling speed requires 1,650–1,750 r/min for standard idle Configuration.
- Measured Scan Resolution: Cylinder displacement delivers 124–125 cm³ power generation Benchmarks.
- Maximum Adjustment Range: Battery storage is designed for 12 V 12 Ah electrical supply Range.
Professional Workshop Service Manual & Technical Specifications
Professional undefined Service Manual: ATV Yamaha YFA1, YFA1(C), YFM125 Breeze 125 Service Manual - Precision Maintenance, Troubleshooting & Repair (1989-2007) Library-Master
Machine-Range: YFA1, YFA1(C), YFM125, YFM125S (1999-2007), Breeze 125 // System-Identifier: Powertrain/Ignition Logic // Machine-Range: Air-cooled 4-stroke, single cylinder; 124 cm³ displacement.
| Framework Element | Documentation Scope | Reference |
|---|---|---|
| Specifications & Data | General dimensions, weights, capacities, electrical systems | Chapter 1 |
| Maintenance Procedures | Periodic checks, adjustments, lubrication intervals | Chapter 3 |
| System Diagnostics | Electrical troubleshooting, wiring diagrams, circuit analysis | Chapters 7-8 |
The documentation is partitioned into foundational reference sections covering the YFA1, YFA1(C), YFM125, and YFM125S platform family, consolidating ignition system documentation, charging architecture, and transmission operations, then documents brake system frameworks, suspension geometry specifications, and electrical circuit routing with complete wiring schematics for the YFA1P/YFA1PC variants.
Operational Sequences
Electrical system documentation covers the C.D.I. ignition architecture, including magneto model specifications, pickup coil resistance parameters, and charging system output ratings. The manual provides comprehensive coverage of the A.C. magneto generator configuration, rectifier/regulator performance data, and battery specifications, documenting charging current across engine speed ranges and standard output capacity for the 14V electrical system.
Structured Nexus
Suspension service documentation covers front and rear travel specifications, spring free lengths, installed dimensions, and spring rate characteristics for both factory and optional configurations. Cable routing sections provide detailed framework for throttle cables, brake circuit leads, fuel system hoses, and crankcase breather connections, with explicit guidance on wire harness fastening, coupler positioning, and hose routing through frame members and guide structures.
Technical Standard
Disassembly instructions are documented for seat and carrier assemblies, front grill and fender components, and rear carrier removal sequences, each with exploded diagrams identifying part numbers, fastener quantities, and torque specifications for reassembly. The manual includes periodic maintenance intervals organized by time and operational hour thresholds, detailing valve clearance checks, spark plug inspection, air filter service, carburetor idle speed verification, and transmission oil replacement protocols.
Structured Protocol
Wear limits are specified for starter motor brush length, commutator diameter undercut depth, and transmission bearing clearances, establishing reference thresholds for component evaluation during overhaul procedures. System operation descriptions cover the constant mesh starter motor configuration, the semi-conductor short circuit regulator type, and lighting system circuit architecture with tail/brake light and headlight bulb specifications matched to factory output ratings.
Systematic Threshold
The document includes torque specifications for fastened assemblies including footrest brackets, front fender mounting points, fuel tank retention hardware, and carrier attachment bolts, documenting torque specifications for the chassis framework to ensure proper mechanical integrity. Wiring diagram sections present the complete YFM125S and YFA1P/YFA1PC electrical architecture with color-coded lead identification, component terminals, switch continuity positions, and signal system circuit logic for neutral/reverse indicator operation and brake light functionality.
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