1986–1989 Honda TRX 250R Fourtrax Service Manual

• Covers all 1986–1989 Honda TRX 250R Fourtrax (liquid-cooled 2-stroke) ATVs.
• Contains 47 exploded-view diagrams and 35 torque-specification tables for engine and chassis systems.
• Key assembly specs included: Cylinder head bolt torque (24–29 N·m / 17–21 ft·lb), spark plug gap (0.7–0.8 mm), and front tire pressure (4.0 psi).
• Features detailed repair coverage for the alternator, clutch, balancer, kick starter, gearshift linkage, steering shaft, and water pump.
• Includes essential wiring diagrams, troubleshooting charts, cable and harness routing drawings, maintenance schedule charts, carburetor cutaway views, altitude adjustment tables, and ignition timing views.

Getting the right specs on the bench fast is critical when you are tearing down a vintage 2-stroke. This 224-page PDF factory service manual (P/N: 00302-HB9-0000) covers the complete 1986–1989 Honda TRX 250R Fourtrax production run. Having this documentation directly at your workspace provides a distinct advantage: it allows you to cross-reference precise factory wear limits and torque sequences during complex rebuilds, significantly reducing assembly errors and ensuring a professional standard. It delivers a complete component-level breakdown of the engine, transmission, balancer, and crankshaft systems.

Outsourcing advanced jobs can quickly become expensive, but this guide outlines the exact procedures needed to perform major workshop tasks yourself. From executing a complete crankcase separation and replacing the crankshaft bearings, to bleeding the twin-piston hydraulic disc brakes and rebuilding the nitrogen-charged Pro-Link rear shock absorber, the content covers it all.

Tuning these liquid-cooled machines requires absolute precision. That is why the documentation details comprehensive fuel system tuning data, including jet needle settings and carburetor theory for varying altitudes and temperatures. Beyond the power plant, you get full factory data for the Pro-Link rear suspension, steering geometry, and hydraulic disc braking systems. Always verify tolerances and wear limits against this official OEM data before reassembling critical chassis or engine components to ensure safe vehicle operation. When servicing vintage braking systems, utilize an OSHA-approved vacuum method to safely manage any potential asbestos fibers, and ensure adequate ventilation against carbon monoxide buildup during engine testing.