1999-2002 Honda TRX400EX Service Manual

Honda TRX400EX 1999–2002 Service Manual

• Covers 1999–2002 Honda TRX400EX Fourtrax models. Focuses on scheduled maintenance, engine teardowns, and electrical diagnostics for the 397cc single-cylinder platform.
• Original OEM publication (PN 07965-VM00100, September 1998). Rely on factory data, not aftermarket guesswork.
• Instant PDF download available the moment you check out. Fully indexed and searchable so you can locate torque specs in seconds.
• Contains over 150 pages of factory exploded-view diagrams and rigid maintenance schedules.
• Lifetime access with no expiration. Print specific pages directly for the shop floor to keep your original digital file grease-free.

Shop Utility & Content Overview

Stop guessing on clearances. This factory reference eliminates trial and error by providing the exact system tolerances and torque values required for professional-grade maintenance. It breaks down the Fourtrax chassis component by component, giving you clear technical data covering the engine, lubrication circuits, fuel delivery, and electrical systems.

Before proceeding with advanced electrical testing or high-pressure engine diagnostics, always review the dedicated safety precautions outlined in the opening chapters to prevent equipment damage or personal injury.

The guide accurately maps out complex sub-assemblies. Need to verify parts on the cylinder head, valve train, transmission, or clutch linkage? The exploded diagrams show exactly how factory components fit together during removal and installation.

Critical Specifications

Key technical specifications are centralized for quick reference. For the 397cc block, cylinder compression should read between 686–883 kPa (100–128 psi). The engine oil capacity stands at 1.85 liters following a standard filter change.

Electrical and ignition baselines are strictly defined by the manufacturer. Expect ignition timing at 8° BTDC at idle, alongside a standard spark plug gap of 0.6–0.7 mm. You will also find comprehensive torque tables for all engine and frame fasteners. Critical values, such as the 44 Nm cylinder head nut torque, are clearly laid out to ensure structural integrity during reassembly.