Honda TRX400EX and TRX400X 2005–2012 Factory Service Manual (OEM)

• Official Honda publication (P/N 0030Z-HN1-A400) featuring 345 pages of mechanical specifications and service procedures
• Contains 83 exploded-view diagrams, 16 electrical schematics, and 4 major torque-specification tables
• Covers the Fuel System, Engine Removal, Cylinder Head, Cylinder and Piston, Clutch, Gearshift Linkage, and Alternator
• Details the Starter Clutch, Crankcase, Transmission, Hydraulic Disc Brake, Electric Starter, Lights and Switches, and Wiring diagrams

Complete Engine and Maintenance Documentation

Mechanics and serious DIYers need reliable data. This PDF acts as the definitive reference for the 397cc single-cylinder engine and transmission architecture common to all 2005–2012 TRX400EX/X models. Displaying these exact factory tolerances directly on your shop monitor provides a distinct advantage: it prevents stripped aluminum threads and ensures every component aligns perfectly to OEM standards during a complex repair. For tasks that typically mandate an expensive dealership visit, the documentation includes step-by-step instructions for separating the crankcase, rebuilding the transmission, overhauling the carburetor, and bleeding the hydraulic disc brake system.

The documentation thoroughly covers standard shop procedures, system identification, and component removal. You get the exact numbers you need to maintain the dry-sump system and power plant. Engine oil capacity is specified at 1.8 liters after draining. Cylinder compression is documented at 686–883 kPa (100–128 psi) in the engineering tables. Need to check the top end? Intake valve clearance is precisely listed at 0.10 mm.

Chassis, Electrical, and Technical References

Coverage extends well beyond the air-cooled engine. The manual breaks down the double-wishbone front suspension and the swingarm rear assembly. It provides critical torque requirements to ensure absolute precision, such as 108 Nm for the clutch center lock nut and 69 Nm for the front wheel hub nut. Following these procedures allows you to confidently execute a safe repair on the chassis and powertrain.

Electrical sections detail the AC-CDI ignition system, spark plug gaps (0.6–0.7 mm for DPR8Z/DPR9Z plugs), and starter motor brushes. Connector pinouts and thorough electrical component routing diagrams take the guesswork out of diagnostic checks, while a dedicated troubleshooting section helps isolate mechanical faults efficiently before you turn a wrench. Furthermore, dedicated sections outline specific maintenance procedures for charging systems. Working on ATVs involves high-tension components and inherent physical risks; always ensure you are using the correct protective gear and rely strictly on these official OEM specifications rather than estimation when servicing your vehicle.