This comprehensive service and repair manual is your ultimate guide to maintaining and repairing your 2004-2007 Honda Rancher 400 AT (TRX400FA/TRX400FGA). Covering both the 4x4 model with automatic transmission (TRX400fa) and the 4x4 model with automatic transmission and GPS (TRX400fga), this manual offers the same detailed information used by Honda dealerships. Dive into a library of step-by-step instructions and original illustrations that guide you through every aspect of your Rancher, from basic maintenance and tune-ups to complex repairs and overhauls. Learn about your ATV's inner workings with clear explanations and hundreds of photographs, making even the most complex tasks accessible. This manual covers a broad range of topics, including: **General Information**: An overview of your Rancher, including specifications and safety instructions. **Technical Feature**: A deeper dive into the technical aspects of your ATV, covering its design and functionality. **Frame/Body Panels/Exhaust System**: Guidance on maintaining and repairing the structural components of your Rancher, including the frame, body panels, and exhaust system. **Maintenance**: Essential maintenance procedures, such as oil changes, filter replacements, and regular checks. **Lubrication System**: Information on the lubrication system, including oil types, capacity, and proper maintenance. **Fuel System**: Understanding and troubleshooting your Rancher's fuel system, covering the carburetor, fuel lines, and fuel tank. **Engine Removal/Installation**: Detailed instructions on removing and reinstalling the engine. **Cylinder Head/Valve/Camshaft**: A comprehensive guide to the cylinder head, valves, and camshaft, including adjustments, repairs, and replacement. **Cylinder/Piston**: Instructions for inspecting, maintaining, and replacing the cylinder and piston components. **Centrifugal Clutch**: Learn about the centrifugal clutch, its operation, and how to adjust or replace it. **Alternator/Starter Clutch**: Information on the alternator, starter clutch, and their respective components. **Sub-Transmission/Gearshift Linkage**: Details about the sub-transmission and gearshift linkage, including adjustments and repairs. **Crankshaft/Automatic Transmission**: Explore the intricate workings of the crankshaft and automatic transmission, covering adjustments and troubleshooting. **Front Wheel/Suspension/Steering**: Guidance on maintaining and troubleshooting the front suspension, steering, and wheel components. **Rear Wheel/Suspension**: Information on the rear suspension, including shock absorbers, linkage adjustments, and wheel maintenance. **Brake System**: Instructions for maintaining and repairing the brake system, covering both front and rear brakes. **Front Driving Mechanism**: Details about the front drive system, including differentials and axles. **Rear Driving Mechanism**: Information on the rear drive system, including the differential and axles. **Battery/Charging System**: Understanding the battery and charging system, including troubleshooting and maintenance. **Ignition System**: Covers the ignition system, including the ignition coil, spark plugs, and timing adjustments. **Electric Starter**: Learn about the electric starter, its operation, and how to troubleshoot any issues. **Lights/Meters/Switches**: Information on your Rancher's lights, instrument cluster, and various switches. **Selectable 4WD System**: Explore the 4WD system, including engaging and disengaging 4WD, and troubleshooting any issues. **HondaMatic**: Guidance on the HondaMatic transmission system, including adjustments and troubleshooting. **Wiring Diagram**: A detailed wiring diagram to help you understand the electrical system of your Rancher. **Troubleshooting**: A comprehensive troubleshooting guide to help you diagnose and resolve common issues. This manual is your essential companion for maintaining and repairing your Honda Rancher 400 AT. It provides the knowledge and instructions you need to perform a wide range of tasks, allowing you to keep your ATV running smoothly and efficiently for years to come.

The Honda FourTrax Rancher 400 AT, produced from 2004 to 2007, is a robust and reliable ATV designed for both recreational and utility purposes. This model, identified by the TRX400FA and TRX400FGA designations, features a powerful 399cc, liquid-cooled, single-cylinder four-stroke engine known for its smooth power delivery and dependable performance. The automatic transmission system, denoted by the "AT" in the model name, offers effortless shifting for a user-friendly riding experience. The Rancher 400 AT comes equipped with a rugged steel frame and suspension components engineered for durability and comfort, allowing it to tackle challenging terrain with ease. The spacious and comfortable seat, along with the adjustable steering wheel, makes for a comfortable ride for riders of various sizes. Further enhancing its versatility, the Rancher 400 AT is capable of towing a substantial load, making it suitable for tasks such as hauling gear, trailers, or even small work implements. The Honda FourTrax Rancher 400 AT embodies the brand's reputation for quality and reliability, making it a popular choice for a diverse range of users. Whether you're seeking an ATV for recreational trail riding, hunting, or farming, the Rancher 400 AT delivers robust performance, comfort, and dependability. Its automatic transmission system simplifies operation, making it an ideal choice for riders of all skill levels. The inclusion of features like a front rack, rear cargo bed, and towing capabilities further contribute to its versatility and practicality. The Rancher 400 AT's inherent ruggedness and ease of maintenance ensure it can handle demanding conditions and provide years of reliable service. Its combination of power, convenience, and durability solidify the Rancher 400 AT as a solid choice for anyone seeking an ATV that can meet their needs.