TRX125 Service Manual Repair 1985-1986 TRX 125

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Tipo: Atv

Proveedor:

SKU: 52374

Etiquetas: 1985 1986 ATC Series Atv Honda Motorcycles TRX 125 TRX125

Variantes de producto

Descripción

This manual covers the 1985 and 1986 TRX125 Fourtrax, a foundational model in the ATV lineup. Known for its reliable engineering and user-friendly operation, the TRX125 was designed for recreational riding and light utility work, establishing a reputation for dependability. This entry-level to mid-range utility ATV offered a capable yet approachable machine, paving the way for subsequent successful TRX models and contributing to the legacy in the ATV market. This comprehensive service and repair manual provides detailed information for maintaining and repairing your 1985-1986 TRX125 Fourtrax. It includes in-depth coverage of all major systems, such as the engine, fuel system, ignition, transmission, drivetrain, brakes, suspension, and electrical system. The manual details scheduled maintenance procedures, troubleshooting guides for common issues, repair and rebuild instructions, and necessary adjustments, all supported by detailed part diagrams and torque specifications to ensure proper service and longevity of the vehicle.

🏷️ Basic Information

Identification

Make:

Honda

Model:

TRX125 Fourtrax

Model Years:

1985, 1986

Codes

Chassis Code Prefix:

👋 Introduction

Market Position

Vehicle Segment:

Entry-level to mid-range utility ATV

Competitive Analysis

Key Competitors:

Yamaha YFM125, Kawasaki Bayou 110/185, Suzuki LT125/160

Key Features

Atv Highlights:

Reliable Honda engineering, user-friendly operation, capable for recreational riding and light utility work, solid shaft drive (typical for this era), independent front suspension (IFS) on later models or solid front axle depending on specific configuration of the 125cc class at the time. The TRX125 was a foundational model in Honda's ATV lineup, prioritizing accessibility and dependability.

📋 Manual Details

Coverage Areas

Primary Coverage:

1985-1986 Honda TRX125 Fourtrax ATV

Page Count

Number Of Pages:

Manual Type

Type:

Service Manual / Repair Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine:

Complete teardown, rebuild, maintenance, troubleshooting, engine components (pistons, rings, crankshaft, connecting rods, valves, camshaft, timing, lubrication system, cooling system)

Fuel System:

Carburetor (including pilot jet, main jet, mixture screw, slow jet adjustments), fuel pump, fuel lines, fuel tank, fuel filter

Ignition System:

Magneto, ignition coil, spark plug, timing adjustments, CDI unit

Transmission:

Gearbox, clutch operation, lubrication, shifting mechanism

Drivetrain:

Drive shafts, U-joints, rear axle, differential (if applicable)

Brakes:

Front and rear brake system components, hydraulic lines, master cylinders, calipers, brake pads, rotors, adjustment, troubleshooting

Suspension:

Front forks (including triple trees, bushings, oil seals), rear suspension (shock absorber, swingarm, linkage, bushings), alignment, maintenance

Electrical System:

Wiring diagrams, battery, charging system (rectifier/regulator, stator), lights (headlights, taillights, brake lights), switches (ignition, starter, kill switch), fuse system

Body And Frame:

Frame inspection, plastic body panels (fenders, shrouds), seat, handlebars, footpegs, trim removal and installation

Wheels And Tires:

Wheel bearing inspection and replacement, tire pressure recommendations, tire replacement, wheel balancing

Procedures Included

Maintenance:

Scheduled maintenance (oil changes, filter replacements, spark plug checks, valve clearance checks), fluid level checks and top-offs, lubrication points

Troubleshooting:

Diagnostic procedures for common problems (e.g., no spark, hard starting, poor running, braking issues, electrical faults, transmission problems), error code explanations (if applicable)

Repair And Rebuild:

Complete engine overhaul, transmission rebuild, suspension component repair, brake system service, electrical component replacement

Installation:

Installation of major components and accessories, proper torquing of fasteners

Adjustment:

Carburetor adjustments, ignition timing adjustments, clutch adjustments, throttle cable adjustments

Torque Specifications:

Detailed torque specifications for all critical fasteners throughout the vehicle are included.

Troubleshooting Guides:

Specific troubleshooting flowcharts and diagnostic trees for common operational problems are provided.

Technical Depth

Depth Of Coverage:

Comprehensive, covering complete teardown and rebuild, detailed part diagrams, torque specifications, and diagnostic procedures for all major systems.

Diagrams And Illustrations:

The manual features detailed part diagrams, exploded views, and service illustrations to aid in identification and assembly/disassembly.

📊 Manual Specifications

File Format

Format Details:

Digital PDF with no printing or saving restrictions. Searchable text and clickable chapters for ease of navigation.

Print Quality

Image Quality:

Includes pictures and part diagrams for clear visual guidance.

Binding Type

Binding Method:

N/A (Digital Download)

Paper Type

Paper Material:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine

Engine Type:

4-Stroke, Air-Cooled, SOHC

Displacement:

124cc

Bore X Stroke:

52.4 mm x 57.8 mm (approximate, specific data in manual)

Compression Ratio:

9.0:1 (approximate, specific data in manual)

Performance

Horsepower:

Approximately 9-10 HP (estimated, specific data in manual)

Torque:

Not explicitly stated as a single peak value, but torque characteristics are detailed for operation and performance tuning within the manual.

Fuel System

Carburetor Model:

Keihin (specific model number likely detailed in manual, e.g., PD Series)

Fuel Type:

Unleaded gasoline

Lubrication

Oil Type:

API SE or SG, SAE 10W-30 recommended (specific viscosity range provided in manual)

Oil Capacity:

Approximately 1.4 Liters (1.5 US qt) with filter change (specific capacity in manual)

🔧 Transmission

Standard

Transmission Type:

5-Speed Manual with Automatic Clutch

Features

Drive System:

Shaft Drive to Rear Wheels

Transmission Oil Type:

Honda Premium Motorcycle Oil (or equivalent API SG, SAE 10W-40) (specific details in manual)

Transmission Oil Capacity:

Approximately 0.7 Liters (0.7 US qt) (specific capacity in manual)

📐 Dimensions

Exterior

Overall Length:

Approx. 1750 mm (68.9 in) (estimate, specific dimensions in manual)

Overall Width:

Approx. 1000 mm (39.4 in) (estimate, specific dimensions in manual)

Overall Height:

Approx. 1030 mm (40.6 in) (estimate, specific dimensions in manual)

Weights

Dry Weight:

Approximately 135 kg (298 lbs) (estimate, specific weight in manual)

Curb Weight:

Not explicitly provided in product info, but manual would contain this.

Wheels And Tires

Front Tire Size:

AT 18 x 7-7 (typical, specific sizes in manual)

Rear Tire Size:

AT 20 x 10-9 (typical, specific sizes in manual)

Fuel Capacity

Fuel Tank Capacity:

Approximately 9.0 Liters (2.4 US gal) (estimate, specific capacity in manual)

🛡️ Safety Features

Ratings

Atv Safety Standards:

Manual would detail operational safety guidelines and recommended practices according to ATV safety standards of the era.

Active Features

Braking System:

Hydraulic disc brakes front and rear (or drum brakes depending on exact model configuration, manual specifies)

Passive Features

Lighting:

Headlight, Taillight, Brake light

💡 Technology Features

Infotainment

Infotainment Features:

N/A (basic utility ATV, no infotainment system)

Driver Assistance

Assistance Features:

N/A (basic utility ATV, no electronic driver assistance systems)

Connectivity

Connectivity Options:

🔧 Maintenance

Service Intervals

Engine Oil Change:

Every 1000 km or 6 months, whichever comes first (typical, specific interval in manual)

Spark Plug Check:

Every 2000 km or 12 months (typical, specific interval in manual)

Valve Clearance Check:

Every 4000 km or 24 months (typical, specific interval in manual)

Air Filter Cleaning:

As needed, depending on operating conditions (detailed cleaning procedure in manual)

Fluid Specifications

Engine Oil Viscosity:

SAE 10W-30 (recommended for general use, manual provides temperature-specific recommendations)

Transmission Oil Viscosity:

SAE 10W-40 (recommended, manual provides specific type)

Known Issues

Common Wear Points:

Carburetor jet clogging, fuel line degradation, suspension bushing wear, U-joint wear, rear axle seal leaks, starter motor brushes (common for vehicles of this age). Manual provides troubleshooting for these.

Electrical Quirks:

Stator output degradation, rectifier/regulator failure, switch contact corrosion. Wiring diagrams in the manual are crucial for diagnosis.

📚 Vehicle History

Brand Heritage

Honda Atv Legacy:

Honda revolutionized the ATV market with the introduction of the ATC (All-Terrain Cycle) and later the Fourtrax series, establishing a reputation for reliability and innovation.

Model Evolution

Trx125 Significance:

The TRX125 was a key model in expanding Honda's ATV offerings, providing a smaller displacement option for riders seeking a capable yet approachable machine. It laid the groundwork for subsequent successful TRX models.

Production

Manufacturing Origin:

Japan (typical for Honda during this period)