Target Audience:
Owners and technicians performing maintenance, repair, and overhaul on 1985-1986 Honda TRX125 Fourtrax ATVs.
Dealer Equivalence:
Provides the same information as the official dealership service manual.
Content Quality:
Hundreds of original photographs and illustrations, step-by-step procedures, comprehensive troubleshooting.
Cost Savings:
Enables DIY repairs and maintenance, saving significant costs compared to dealer labor.
Delivery:
Instant download via a provided link after purchase.
Primary Coverage:
Comprehensive service, repair, and overhaul
Secondary Coverage:
Maintenance, tune-up, troubleshooting, diagnostics
Type:
Official Workshop Service and Repair Manual (FSM)
Format:
PDF (Digital Download)
Powertrain:
Engine, transmission, clutch, drive mechanism, sub-transmission
Chassis:
Front wheel, rear wheel, steering, suspension (front fender, rear fender)
Electrical:
Ignition system, battery, charging system, starter system, lights, switches
Fuel System:
Fuel system (carburetor, fuel tank)
Braking System:
Front brake, rear brake
Exhaust System:
Exhaust pipe
Maintenance:
Lubrication, scheduled maintenance, tune-ups, fluid changes
Repair Overhaul:
Engine rebuild, transmission overhaul, clutch service, starter replacement, electrical component repair, brake system service, suspension overhaul
Troubleshooting:
Comprehensive troubleshooting guide for common problems and diagnostics
Installation:
Engine installation/removal, component installation
Depth:
Highly detailed, step-by-step instructions with hundreds of original photographs and illustrations. Suitable for first-time mechanics to experienced technicians.
Engine Type:
Air-cooled, 4-stroke, OHC, single-cylinder
Displacement:
124 cc (approx.)
Bore X Stroke:
Not explicitly stated in provided data, but detailed in manual.
Compression Ratio:
Not explicitly stated in provided data, but detailed in manual.
Horsepower:
Not explicitly stated in provided data, but detailed in manual.
Torque:
Not explicitly stated in provided data, but detailed in manual.
Carburetor Type:
Not explicitly stated in provided data, but covered in manual (likely a single downdraft carburetor).
Fuel Capacity:
Not explicitly stated in provided data, but detailed in manual.
Oil Type Recommendation:
Manual will specify viscosity and API classification for engine oil.
Oil Capacity:
Not explicitly stated in provided data, but detailed in manual.
Ignition Type:
CDI (Capacitor Discharge Ignition), potentially with a magneto.
Starting Method:
Recoil starter (kick start) and likely electric starter.
Type:
Automatic (likely a Continuously Variable Transmission - CVT, or torque converter based automatic).
Gear Selection:
Not applicable for CVT/automatic, likely a selector for forward, neutral, reverse.
Drive Mechanism:
Shaft drive (to rear wheels), potentially with limited-slip differential or solid axle.
Sub Transmission:
Manual covers sub-transmission operations, suggesting potential gear reduction or other selectable drive modes.
Transmission Fluid:
Manual will specify recommended fluid type and capacity.
Overall Length:
Not explicitly stated in provided data, but detailed in manual.
Overall Width:
Not explicitly stated in provided data, but detailed in manual.
Wheelbase:
Not explicitly stated in provided data, but detailed in manual.
Dry Weight:
Not explicitly stated in provided data, but detailed in manual.
Curb Weight:
Not explicitly stated in provided data, but detailed in manual.
Crash Test Ratings:
N/A (ATV - Not applicable for standardized automotive crash ratings).
Braking System Description:
Drum brakes on both front and rear wheels, as typical for this era and class of ATV.
Lighting:
Headlight, taillight, and brake light systems covered.
Oil Change Interval:
Manual will specify recommended intervals based on operating hours or mileage.
Air Filter Cleaning:
Manual will detail cleaning and replacement intervals for the air filter.
Spark Plug Maintenance:
Manual will provide specifications and recommended service intervals for the spark plug.
Engine Oil Viscosity:
Manual will specify the correct SAE viscosity grade (e.g., SAE 10W-30, SAE 20W-40) and API classification.
Brake Fluid Type:
Manual will specify the DOT classification for brake fluid (likely DOT 3).
Gear Oil Type:
Manual will specify the type of oil for the final drive/gearbox if separate from engine oil.
Common Wear Items:
Manual covers maintenance for wear items such as brake pads, tires, spark plugs, and air filters.
Troubleshooting Focus:
Addresses common problems like starting issues, poor performance, and electrical faults, providing diagnostic steps.
Manufacturer:
Honda Motor Co., Ltd. - renowned for reliability and innovation in motorcycles and ATVs.
Introduction Context:
The TRX125 Fourtrax was part of Honda's early expansion into the recreational and utility All-Terrain Vehicle market, building on their motorcycle expertise.
Product Line:
A foundational model in the Fourtrax line, preceding more powerful and feature-rich models. It established Honda's reputation for durable, user-friendly ATVs.
Manufacturing Origin:
Likely manufactured in Japan or North America, consistent with Honda's production facilities during this period.
