2005-2009 Honda TRX400EX Service Manual

This service manual covers the TRX400EX for 2005-2009, including general information, technical features, maintenance, and engine-related systems. PN C4256-90954.

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Document Details

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Document Number / Seller:
31765 / Mary Reyes
File Size:
37.73 MB
File Type:
PDF
Language:
English
Pages:
345
Printable:
Yes
Category:
ATV
Last updated / verified
Aug 16, 2025

Models Covered & Key Technical Specifications

Honda TRX400EX (2005-2009) (C4256-90954) - 2005-2009 Service Manual | Engine Section.

  • Engine Oil Capacity: 1.8 liters (1.9 US qt, 1.6 Imp qt) defines the recommended fluid volume for proper operation.
  • Throttle Free Play: For optimal throttle response, 3 – 8 mm (1/8 – 5/16 in) controls the cable slack.
  • Engine Dry Weight: 42.5 kg (93.7 lbs) represents the total mass of the engine assembly.
  • Rear Wheel/Suspension Specs: The suspension system requires 30 – 40 mm (1 – 1.5 in) for optimal travel and stability.
  • Primary Reduction Gear Ratio: 2.756 (14/39) establishes the gear reduction for efficient power transfer.
  • Ignition System Specs: AC-CDI ignition system ensures reliable spark delivery for combustion.

Manual Description & Preview

Honda TRX400EX (2005-2009) Service Manual: Engine-Compendium

Diagnostic-Area: TRX400EX (2005-2009) // Application-Range: ATV / Engine Logic // Diagnostic-Area: Technical Manual.

Service-Nexus Operational-Logic Calibration-Standards
General Information Maintenance Specifications
Engine Removal/Installation Lubrication System Cylinder Head/Valve
Cylinder/Piston Clutch/Gearshift Linkage Alternator/Starter Clutch
Fuel System Troubleshooting Troubleshooting

Service procedures are grouped by system, covering engine removal and installation, lubrication, and various engine components. It includes detailed specifications for parts and systems, ensuring accurate maintenance and repair. Key systems such as the fuel system, ignition, and electrical components are thoroughly documented. The manual also provides comprehensive troubleshooting guidance for common issues. Effectively requiring accurate assembly, this document details procedures for engine disassembly, torque specifications for critical fasteners, and component measurements to ensure proper operation and joint separation prevention.

This manual documents torque specifications for critical engine components to ensure proper joint separation prevention.

FAQ

Assess the **critical** calibration settings for optimal performance. keyboard_arrow_down

1.400 ± 100 rpm (min⁻¹) is the specified idle speed for the TRX400EX, ensuring stable operation when the engine is warm.

What components have **required** clearance measurements? keyboard_arrow_down

Valve clearance requires a specific measurement of 0.10 mm (0.004 in) for intake and 0.12 mm (0.008 in) for exhaust in both IN/EX states.

Confirm the **specified** torque specifications. keyboard_arrow_down

20 N·m (2.0 kgf·m, 15 lbf·ft) is the specified torque for the rear brake caliper mounting bolts, crucial for safe and effective braking.

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