1985–1987 Honda FourTrax 250 / TRX 250 Service Manual (OEM)

• 233-page official Honda factory service publication (P/N: 61HA802) detailing engine, chassis, and electrical system specifications
• Covers all 1985–1987 Honda FourTrax 250 and TRX 250 ATVs, highlighting specific service requirements across different model years
• Contains 80+ exploded-view assembly diagrams alongside complete torque specification tables for critical fasteners
• Definitive technical reference for maintaining the 246 cc air-cooled engine and semi-automatic drivetrain
• Explores the dual-valve carburetor, final drive gearcase, gearshift linkage, kick starter, and cam chain tensioner
• Delivers a high-resolution PDF featuring comprehensive wiring diagrams, cable routing drawings, lubrication flow charts, maintenance schedules, and gear tooth contact patterns

Manual Contents and System Breakdowns

The Honda FourTrax 250 service manual provides a structured look at routine maintenance and complete engine removal. It is built for the bay, helping technicians streamline complex repairs and reduce bench time instead of relying on trial and error. The document includes highly detailed exploded-view assemblies for the 4-stroke engine, manual clutch, centrifugal clutch, and the 5-speed constant mesh transmission. Bypassing the high costs of a dealership, this guide supplies the exact step-by-step procedures required to tackle heavy-line tasks yourself, such as rebuilding the steering knuckle bushings, overhauling the carburetor, and adjusting the final drive gear backlash. It maps out the lubrication system, detailing pump and filter servicing, while also defining steering geometry for the front suspension. Working on these older ATVs requires caution. Always verify the vehicle is securely supported on appropriate stands and the exhaust is completely cool before starting any inspection or teardown to prevent severe injury.

Electrical and Braking Parameters

Need precise reference values? The electrical section lays them out clearly for the CDI ignition, alternator output, and the complete charging system. Rather than swapping parts blindly, mechanics can follow structured troubleshooting chapters to effectively isolate ignition faults and voltage drops. Detailed braking information covers maintenance thresholds for both the front hydraulic and rear cable-operated drum brakes. Furthermore, the manual features realistic schedules for regular inspections based on actual operating conditions and harsh environmental usage.

Technical Data Preview

Factory specifications provide absolute clarity for component rebuilding. Engine compression sits at a documented 12.5 kg/cm² for the 246 cc block. Intake and exhaust valve clearance is strictly specified at 0.08 mm within the cylinder head specification table. When bolting components back together, cylinder head cap nut torque must be dialed in at 35–45 Nm (25–33 ft-lb). For routine seasonal work, the text outlines precise oil filter replacement steps and exact final drive oil capacities. It also provides critical wear limits for the piston, cylinder, and clutch components. When overhauling the '85–'87 TRX250, mechanics must be aware of specific repair pitfalls. For instance, the centrifugal clutch lock nut utilizes left-hand threads that are easily stripped if conventionally forced counterclockwise during disassembly. Additionally, if the neutral (light green/red) and reverse (gray) switch wires are accidentally interchanged, the neutral indicator will falsely illuminate while the ATV is in reverse, causing unexpected and dangerous backward acceleration.