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    TRX125 Service Manual Repair 1987-1988 TRX 125

    $16.99
    $16.99
    The TRX125 Fourtrax, a first-generation model produced from 1987 to 1988, represents a reliable and user-friendly entry-level All-Terrain Vehicle designed for recreational riders and beginner ATV enthusiasts. Known for its...
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    Type: Atv
    Vendor:
    Honda
    Sku: 145138
    Tags: 1987 1988 ATC Series Atv Honda Motorcycles TRX125
    The TRX125 Fourtrax, a first-generation model produced from 1987 to 1988, represents a reliable and user-friendly entry-level All-Terrain Vehicle designed for recreational riders and beginner ATV enthusiasts. Known for its accessible maintenance and operation, this air-cooled, single-cylinder ATV features a 124 cc engine paired with a 5-speed manual transmission and reverse gear, offering a capable platform for various terrains. The reputation for engineering quality and durability is evident in the TRX125, making it a solid choice for those seeking an affordable and dependable ATV experience. This comprehensive Service & Repair Manual provides detailed guidance for the complete tear-down and rebuild of your TRX125 Fourtrax. Covering all major mechanical and electrical systems, including the engine, fuel, ignition, drivetrain, suspension, brakes, and electrical components, this manual is an essential resource for owners and technicians. With included pictures, part diagrams, torque specifications, maintenance schedules, and troubleshooting procedures for common issues, this manual empowers users to effectively maintain, diagnose, and repair their vehicle, ensuring optimal performance and longevity.
    🏷️ Basic Information
    Identification
    Make:
    Honda
    Model:
    TRX125 Fourtrax
    Generation:
    First Generation
    Production Years Covered:
    1987-1988
    👋 Introduction
    Market Position
    Vehicle Segment:
    Entry-level All-Terrain Vehicle (ATV)
    Competitive Analysis
    Competitors:
    Similar displacement ATVs from Yamaha (e.g., Warrior 200/250), Suzuki (e.g., LT250R), Kawasaki (e.g., Lakota 300, though slightly larger displacement)
    Key Features
    Target Audience:
    Recreational riders, beginner ATV enthusiasts
    Value Proposition:
    Reliable, user-friendly, and affordable ATV with a focus on accessible maintenance and operation
    📋 Manual Details
    Coverage Areas
    Manual Type:
    Service & Repair Manual
    Coverage Scope:
    Complete tear down and rebuild
    Included Content:
    Pictures, part diagrams, torque specs, maintenance, troubleshooting
    Page Count
    Page Count:
    193
    Manual Type
    Manual Format:
    PDF (Digital Download)
    Interactivity:
    Clickable chapters, searchable text
    Language
    Language:
    English
    Restrictions
    Printing Policy:
    No restrictions on printing
    Saving Policy:
    No restrictions on saving/burning to disc
    📖 Manual Coverage
    Systems Covered
    Engine:
    Complete engine disassembly, assembly, inspection, and adjustment
    Fuel System:
    Carburetor (carb), mixture screw, pilot jet, main jet, fuel pump, EFI (Electronic Fuel Injection) considerations (though primarily carbureted for this model, manual may address related components)
    Ignition System:
    Magneto, stator, coil, spark plug, troubleshooting no spark issues
    Drivetrain:
    Transmission, primary reduction gear, clutch, drive shaft, rear axle, swingarm, linkage
    Suspension:
    Front forks, rear struts, suspension adjustment
    Brakes:
    Hydraulic brakes, brake pads, brake rotors, brake adjustment
    Electrical System:
    Lights (headlight, taillight), charging system (regulator, rectifier, stator), battery, starter, switches, throttle cable
    Bodywork:
    Panels, fenders, plastics, seat, fuel tank
    Frame And Chassis:
    Frame inspection, steering system, wheel bearings, hubs
    Procedures Included
    Maintenance:
    Lubrication schedule, fluid changes (coolant, engine oil), tire pressure, chain adjustment, spark plug replacement
    Troubleshooting:
    Diagnosing common problems (e.g., no spark, starting issues), error code interpretation (if applicable to electronic components)
    Repair:
    Complete overhaul and repair procedures for all major mechanical and electrical components
    Installation:
    Guidance on installing various parts and components
    Adjustment:
    Carburetor adjustment, idle speed adjustment, clutch adjustment, brake lever adjustment
    Technical Depth
    Depth Level:
    Comprehensive (from basic maintenance to full rebuild)
    Diagnostic Capabilities:
    Detailed troubleshooting guides and potential error code explanations
    Torque Specifications:
    Comprehensive torque specifications for all critical fasteners and components
    📊 Manual Specifications
    File Format
    File Type:
    PDF
    Print Quality
    Image Quality:
    Assumed high quality to support diagrams and pictures
    Binding Type
    Binding Style:
    N/A (Digital Download)
    Paper Type
    Paper Quality:
    N/A (Digital Download)
    ⚙️ Engine Specifications
    Primary Engine
    Engine Type:
    Four-stroke, single-cylinder, SOHC
    Displacement:
    124 cc (Cubic Centimeters)
    Bore X Stroke:
    54.0 mm x 54.0 mm (approximate, refer to manual for exact)
    Compression Ratio:
    Approx. 9.0:1 (verify in manual)
    Performance
    Horsepower:
    Estimated 10-12 HP (approximate, highly dependent on tuning and specific model year)
    Torque:
    Refer to manual for specific torque figures
    Fuel System
    Carburetor:
    Single Keihin carburetor (specific model designation to be confirmed in manual, likely 24mm or 26mm)
    Fuel Delivery:
    Gravity feed from fuel tank with a fuel pump (mechanical or electric, to be confirmed)
    Cooling System
    Cooling Method:
    Air-cooled
    Starting System
    Start Type:
    Kickstart (kicker), Electric start (starter)
    Engine Components
    Valve Clearance:
    Specific clearance values and adjustment procedures provided in manual
    Crankshaft And Conrod:
    Inspection, measurement, and replacement procedures for crankshaft and connecting rod
    Camshaft:
    Installation, timing, and inspection of the camshaft
    🔧 Transmission
    Standard
    Transmission Type:
    5-speed manual transmission with automatic clutch
    Optional
    Transmission Options:
    N/A (only one standard transmission type)
    Features
    Drive Type:
    Shaft drive (to rear axle)
    Reverse Gear:
    Yes
    📐 Dimensions
    Exterior
    Overall Length:
    Approx. 72 inches (1829 mm) - verify in manual
    Overall Width:
    Approx. 42 inches (1067 mm) - verify in manual
    Overall Height:
    Approx. 41 inches (1041 mm) - verify in manual
    Weights
    Dry Weight:
    Approx. 335 lbs (152 kg) - verify in manual
    Curb Weight:
    Refer to manual for exact curb weight with fluids
    Tires
    Front Tire Size:
    AT18 x 7-8 (verify in manual)
    Rear Tire Size:
    AT18 x 9-8 (verify in manual)
    Recommended Tire Pressure:
    Refer to manual for specific PSI recommendations
    🛡️ Safety Features
    Ratings
    Safety Certifications:
    ANSI/SVIA standards for ATVs
    Active Features
    Braking System:
    Hydraulic disc front brakes, drum rear brake (verify in manual)
    Passive Features
    Rollover Protection:
    N/A (standard ATV design, does not include ROPS)
    💡 Technology Features
    Infotainment
    Infotainment System:
    N/A (Basic ATV, no digital displays or infotainment)
    Driver Assistance
    Driver Assistance Features:
    N/A
    Connectivity
    Connectivity Options:
    N/A
    🔧 Maintenance
    Service Intervals
    Engine Oil Change:
    Refer to manual for specific interval (typically every 1000-2000 miles or annually)
    Spark Plug Replacement:
    Refer to manual for specific interval (often at first major service and then periodically)
    Air Filter Cleaning:
    Regular inspection and cleaning/replacement based on operating conditions (refer to manual)
    Fluid Specifications
    Engine Oil Type:
    API SE or SF, SAE 10W-40 or 20W-50 (verify viscosity based on ambient temperature in manual)
    Engine Oil Capacity:
    Refer to manual for exact capacity (likely around 1.5-2.0 liters)
    Brake Fluid Type:
    DOT 3 or DOT 4 hydraulic brake fluid (verify in manual)
    Coolant Type:
    N/A (Air-cooled engine)
    Fuel Octane Rating:
    Refer to manual, typically 86-87 octane minimum
    Known Issues
    Common Problems:
    Carburetor gumming due to fuel age, potential CDI unit failure, worn clutch plates, electrical connector corrosion
    Troubleshooting Topics:
    Starting problems, loss of power, poor idling, electrical faults (lights, ignition)
    📚 Vehicle History
    Brand Heritage
    Manufacturer:
    Honda Motor Co., Ltd.
    Model Evolution
    Predecessor:
    Honda TRX70 (smaller displacement, less powerful)
    Successor:
    Honda TRX125 was a step towards the more popular TRX250 Fourtrax and later Sportrax models.
    Production
    Manufacturing Origin:
    Japan (likely, for Honda ATVs of this era)
    🏆 Awards & Recognition
    Recognitions
    Brand Awards:
    Honda is widely recognized for reliability and quality across its product lines.
    Ratings
    Consumer Ratings:
    Generally positive for durability and ease of use for its era, though often overshadowed by larger models.
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