Honda Fourtrax TRX 250X ATV Service & Repair Manual, 1987

Honda service manual for the 1987 Fourtrax TRX 250X ATV, issued in November 1986. The publication is organized into 18 sections, including maintenance, system repairs, troubleshooting, and an index.

PDF Bookmarks, Wiring Detail, and Page Count

Search and diagram access: PDF text search is not available. Embedded bookmarks cover the main manual’s chapters, with additional entries for the beginning of the repeated copy. Small wiring labels are readable when enlarged; the full wiring diagram is oriented sideways.

One printable English PDF contains 458 pages, comprising the same 229-page manual twice: PDF pp. 1–229 and 230–458. Each copy includes its cover, safety notice, contents/use guide, and 10 memo pages within that total.

Engine Overhaul, Chassis Service, and Electrical Diagnosis

The following selected contents outline the main repair areas. Other topics include spark-arrester cleaning and fender/exhaust-system removal and installation.

• Engine and valve train: Engine removal and installation, cylinder-head disassembly, valve-guide replacement, valve-seat refacing, camshaft inspection, and cam-chain timing.

• Cylinder and lubrication: Piston and ring inspection, cylinder wear measurements, oil-filter replacement, oil-pump disassembly, and rotor-clearance checks.

• Clutch and transmission: Clutch inspection and reassembly, kick-starter service, gearshift-linkage repair, crankcase separation, and internal transmission and crankshaft work.

• Fuel system: Dual-valve carburetor disassembly and assembly, throttle-valve synchronization, pilot-screw adjustment, and high-altitude jetting instructions.

• Suspension and steering: Double wish-bone front-suspension service, wheel-hub bearings, tie-rods, steering-shaft bearings, rear-axle bearings, and swingarm pivot repairs.

• Hydraulic brakes: Front and rear pad replacement, disc inspection, caliper and master-cylinder overhaul, parking-brake service, and fluid replacement/bleeding.

• Electrical troubleshooting: Ignition-system checks, alternator coil tests, AC-regulator diagnosis, switch-continuity tables, wiring diagrams, and symptom-based troubleshooting charts.

Suited to mechanically qualified users with appropriate workshop tools; Honda recommends dealer-only service for the marked wheel and steering maintenance items.

Top-End Repair and Lubrication

Step-by-step instructions cover valve-guide replacement and valve-seat refacing, with separate inspection limits for the camshaft, rocker arms, valve springs, cylinder, piston, and rings. Cam-sprocket alignment illustrations support the timing procedures.

The cylinder-head cautions explain that torch heating during valve-guide work can warp the head. The manual also identifies the required valve-service tools and lists component-specific torque values.

The lubrication-system flow view shows the oil path through the engine. Oil-pump inspection distinguishes rotor-tip, rotor-to-body, and end clearances, while the maintenance section provides oil-change procedures and a service schedule with allowances for severe riding conditions.

Carburetor Setup and Internal Drivetrain Work

The carburetor’s exploded assembly view identifies the float, diaphragm, jets, and throttle-valve components. Separate instructions address synchronization and altitude-related settings, including the operating limits of the high-altitude configuration.

The pilot-screw cautions identify seat damage from overtightening.

For internal drivetrain repair, the manual documents mainshaft and countershaft disassembly, gear and bushing inspection, shift-fork measurements, and crankshaft/balancer alignment. The transmission assembly view shows gear arrangement and lubrication points. The primary-drive gear locknut is identified as left-hand threaded.

Wheel Bearings, Suspension, and Brake Components

Chassis procedures extend to front-arm spherical bearings, rear-axle bearing-holder service, and swingarm needle bearings. Alignment coverage distinguishes adjustable toe-in from nonadjustable camber and caster.

Rear-shock coverage includes spring removal and inspection, but the nitrogen-filled damper unit is not to be disassembled. Observe the manual’s vehicle-support and pressurized-shock precautions during chassis work.

Brake chapters include piston and bore measurements, seal installation, and parking-brake mechanism service. The brake-fluid precautions address contamination and damage to painted, plastic, and rubber parts.

Fault Tracing and Wiring References

Cable and harness routing drawings, the ignition-system inspection schematic, and the full wiring diagram support component and circuit checks. Troubleshooting charts connect hard starting, power loss, poor running, and handling symptoms with possible causes.

Together, the inspection limits, assembly views, torque tables, and diagnostic charts support both overhaul planning and fault tracing. For example, secondary-coil tests distinguish readings with and without the spark-plug cap to help separate a cap fault from a coil fault.

Sample Oil-Fill and Top-End Specifications

The lubrication section specifies an engine-oil capacity of 2.0 liters after disassembly and distinguishes that fill condition from routine oil servicing.

Valve-clearance data specify 0.10 mm for both intake and exhaust with the engine cold, below 35°C/95°F. The cylinder-head torque table lists 35–45 N·m for the head nuts and bolts; the installation section also specifies staged tightening.