1987-1988 Honda TRX 250X FourTrax Service Manual (P/N C4085-91017)

• Essential reference material for professional workshops and DIY mechanics handling 1987–1988 Honda TRX 250X FourTrax repair and restoration
• Features 56 individual torque reference tables for precise engine and frame fastener assembly
• Original factory documentation detailing the C4085-91017 build series, complete with full exploded-view schematics for the engine, transmission, and chassis

Technical Documentation Overview

The 1987–1988 Honda TRX 250X FourTrax service manual provides exhaustive data on the 246.4 cc air-cooled powerplant. It breaks down the internal components piece by piece. You get comprehensive coverage of the cylinder head, valves, crankshaft, and the 5-speed constant mesh transmission. Navigating this factory documentation ensures precise identification for complex assemblies like the clutch, oil pump, and kick starter mechanisms. Safety remains paramount during any shop work; always verify the ATV is securely supported and the battery disconnected prior to mechanical intervention.

Specification Highlights

Accurate tightening values are non-negotiable. This guide lists the exact 35–45 Nm torque for cylinder head nuts alongside 60–80 Nm for the primary drive gear lock nut. For baseline engine diagnostics, cylinder compression is strictly documented at 1,275 ± 100 kPa, while valve clearance is set at 0.10 mm across both intake and exhaust valves. Planning a full engine teardown? Expect a 2.0-liter oil system capacity. Beyond the engine, detailed sections map the double-cradle frame geometry, front wishbone suspension, and hydraulic brake systems. Mechanics also rely on the extensive wiring diagrams to troubleshoot the CDI ignition and alternator circuits, ensuring accurate component repair.