1985-1986 Honda TRX125 Fourtrax Service Manual
Field service reference for the Honda TRX125 Fourtrax. Documents engine, transmission, and chassis systems, with procedural and diagnostic information. Comprehensive archive for efficient repairs. PN 61800-958-010.
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Sample pages from the 1985-1986 Honda TRX125 Fourtrax Service Manual manual
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Honda Models Covered & Key Technical Specifications
Models: Honda TRX125, Fourtrax 125
Sub-models / Variants: 1985–1986 model years, '85 and After '85 variants
Trade Names: Fourtrax
Build Years: 1985–1986
Technical Data:
- Engine displacement: 124 cc (7.6 cu in)
- Engine type: Gasoline, air-cooled 4-stroke single cylinder
- Horsepower: 8.6 BHP @ 7,500 rpm
- Torque: 0.89 kg-m (7.0 ft-lb) @ 5,500 rpm
- Transmission: 4-speed constant-mesh with reverse
- Clutch: Wet multi-plate automatic
- Oil capacity: 1.0 L (after draining), 1.2 L (after disassembly)
- Fuel capacity: 7.3 L ('85), 7.5 L (After '85)
- Tire pressure (front): 2.9 psi (0.20 kg/cm²)
- Idle speed: 1,700 ± 100 rpm
Honda Manual Features & Content Preview
Honda TRX125 Fourtrax 1985–1986 Technical Scope
- Covers 1985–1986 Honda TRX125 and Fourtrax 125 models, including both '85 and After '85 design variants
- Official Honda shop manual, form number 61800-958-010, published 1985
- Contains 93 pages of technical specifications, torque values, and system-specific diagrams for the TRX125 series
- File includes comprehensive diagrams for cable/harness routing, lubrication flow, and fuel system assembly
- Accessible from your device as soon as the order is placed
- Suitable for printing individual sections for shop-floor use
- This 1985 publication serves as the primary technical reference for the 124cc air-cooled Fourtrax 125 build
Technical Documentation and System Walkthrough
This 1985–1986 Honda TRX125 service manual provides a comprehensive overview of the maintenance and disassembly procedures for the Fourtrax 125 platform. The document is segmented by location and system, detailing the general information, lubrication points, and maintenance schedules required for both initial operation and regular service intervals. Chapters are dedicated to engine removal and installation, cylinder head and valve maintenance, as well as the piston and cylinder assembly. The fuel system section covers carburetor adjustments, including pilot screw settings and high-altitude configurations specific to the TRX125 series.
Specification and Reference Data Preview
The 1985 Honda TRX125 technical data provided in this manual includes crucial reference values for engine assembly and chassis maintenance. Intake and exhaust valve clearance is specified at 0.07 mm for cold engine conditions. The 1985–1986 Honda TRX125 engine oil capacity is documented at 1.0 liters after draining, while the crankcase capacity after disassembly is listed as 1.2 liters. Cylinder compression for the 1985–1986 Honda TRX125 is set at a standard of 12.5 ± 1.5 kg/cm². The manual also provides detailed what an OEM service publication covers including torque values for critical fasteners, such as the 20–22 Nm specification for cylinder head nuts. Reference only — always consult a certified technician before performing service on this equipment. An official Honda OEM shop manual covering the 1985–1986 TRX125 Fourtrax, documenting engine, chassis, electrical, and fuel system specifications for the air-cooled single-cylinder platform.
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