This comprehensive service and repair manual is specifically designed for the Honda TRX125 Fourtrax, covering the 1985 and 1986 model years. It's packed with detailed instructions and illustrations guiding you through every aspect of maintenance, tune-up, repair, and overhaul. This manual is your go-to resource for understanding your ATV inside and out. It's the same information your local dealer uses, ensuring accuracy and reliability.

The manual includes step-by-step instructions and numerous original photographs and illustrations created during the complete disassembly of the ATV. This visual guidance makes even complex procedures easy to follow, even for those new to ATV repair.

**Here's what you'll find in this manual:**

* **General Information:** Essential overview of your TRX125 Fourtrax, including specifications and safety guidelines.
* **Lubrication:** Proper lubrication procedures for all components, ensuring optimal performance and longevity.
* **Maintenance:** Regular maintenance schedules and detailed instructions on essential tasks like oil changes, filter replacements, and adjustments.
* **Fuel System:** In-depth information on the carburetor, fuel lines, and fuel tank, covering troubleshooting and repair procedures.
* **Engine Removal/Installation:** Complete instructions for removing and reinstalling the engine, along with critical alignment and torque specifications.
* **Cylinder Head/Valves:** Detailed instructions on inspecting, adjusting, and replacing valves, valve guides, and the cylinder head.
* **Cylinder/Piston:** Comprehensive guidance on inspecting, replacing, and honing the cylinder and piston.
* **Clutch/Oil Pump:** Thorough information on troubleshooting and repairing the clutch system and the oil pump.
* **Recoil Starter/Alternator/Cam Chain Tensioner:** Complete instructions on inspecting, adjusting, and replacing these critical components.
* **Sub-Transmission:** Detailed instructions on the sub-transmission, including disassembly, inspection, and assembly procedures.
* **Transmission/Crankshaft:** Comprehensive information on the transmission and crankshaft, covering repair and alignment procedures.
* **Front Wheel/Brake/Steering:** Step-by-step instructions for inspecting, adjusting, and replacing components in the front wheel, brake, and steering systems.
* **Rear Wheel/Brake/Drive Mechanism:** Detailed instructions for the rear wheel, brake system, and drive mechanism, including troubleshooting and repair procedures.
* **Front Fender/Rear Fender/Exhaust Pipe:** Instructions for inspecting, adjusting, and replacing these components.
* **Ignition System:** Comprehensive information on the ignition system, including troubleshooting and repair procedures for the magneto, coil, and spark plug.
* **Battery/Charging System:** Instructions for inspecting, charging, and replacing the battery and understanding the charging system.
* **Starter System:** Detailed information on the starter system, including troubleshooting and repair procedures.
* **Lights/Switches:** Instructions for inspecting, adjusting, and replacing lights and switches.
* **Troubleshooting:** A comprehensive troubleshooting guide to help identify and resolve common issues with your TRX125 Fourtrax.
* **Index:** A detailed index for quick and easy reference to specific components and procedures.

This manual is your essential resource for understanding and maintaining your Honda TRX125 Fourtrax. It empowers you to perform repairs and maintenance efficiently and confidently, saving you time, money, and the frustration of dealing with unfamiliar ATV mechanics.

The Honda TRX125 Fourtrax, produced from 1985 to 1986, stands as a classic and highly respected entry-level ATV, marking the beginning of Honda's dominance in the utility-focused ATV market. This model was designed for riders of all ages and skill levels, offering a balance of affordability, ease of use, and reliability. Powering the TRX125 was a robust 124cc, single-cylinder, air-cooled engine, known for its smooth and predictable power delivery. The engine was mated to a 3-speed semi-automatic transmission with reverse, providing a simple and intuitive riding experience. A dependable shaft drive system ensured power delivery to the rear wheels, while a durable suspension system with independent front and rear arms provided a comfortable and controlled ride. The TRX125 also featured a reliable braking system with front disc and rear drum brakes, offering good stopping power.

Despite its compact size, the TRX125 Fourtrax proved capable of handling various tasks, from casual trail riding to light farm work. Its rugged construction and low center of gravity provided stability and confidence on various terrains. The TRX125 was initially offered in three distinct colorways: Metallic Red, Metallic Black, and Metallic Blue. These color options contributed to the model's popularity, attracting riders of all ages who could easily find a shade to suit their preferences. The TRX125 Fourtrax, with its simple design, reliable performance, and affordable price, quickly became a favorite among recreational ATV enthusiasts and utility-focused riders. Its legacy continues to live on, with many TRX125s still actively used and appreciated by owners who value its work ethic and timeless character.