1986 Honda 250 Fourtrax Parts Manual

The 1986 Honda 250 Fourtrax is a reliable all-terrain vehicle featuring a 246cc four-stroke engine, shaft drive system, front and rear suspension, electric start, and durable construction. This parts manual provides comprehensive information for maintenance, repair, and replacement of all components. Below are key sections covering parts identification, specifications, maintenance procedures, and troubleshooting.

1. Introduction & Safety 2. General Specifications 3. Engine Components 4. Chassis & Frame 5. Suspension System 6. Drive Train 7. Electrical System 8. Brake System 9. Maintenance Schedule 10. Parts Replacement Guide 11. Troubleshooting

Introduction & Safety

This manual contains detailed parts information for the 1986 Honda 250 Fourtrax ATV. Always follow safety procedures when performing maintenance or repairs.

Safety Item	Description
Work Area	Ensure clean, well-lit workspace
Protective Equipment	Wear safety glasses and gloves
Vehicle Support	Use proper stands to support ATV
Battery Safety	Disconnect battery before electrical work
Fuel Safety	Work in well-ventilated area, no open flames

General Specifications

Model: 1986 Honda 250 Fourtrax
Engine Type: 246cc 4-stroke OHC single cylinder
Bore x Stroke: 74.0mm x 57.8mm
Compression Ratio: 9.2:1
Fuel System: 24mm piston-valve carburetor
Starting System: Electric and auxiliary recoil
Transmission: 5-speed with reverse
Drive System: Shaft drive
Suspension: Independent front, swingarm rear
Brakes: Drum brakes front and rear
Tires: Front: 22x7-10, Rear: 22x10-10

Engine Components

Complete breakdown of engine parts including cylinder head, piston assembly, crankshaft, and valve train.

Cylinder Head Assembly: Includes valves, springs, camshaft
Piston & Rings: Standard size and oversize options
Crankshaft & Connecting Rod: Main bearings and seals
Camshaft & Timing: Cam chain and sprockets
Oil Pump & Filter: Lubrication system components

WARNING! Always torque bolts to specified values. Use genuine Honda parts for optimal performance.

Chassis & Frame

Frame components, brackets, and mounting hardware for the 1986 Fourtrax.

Part Number	Description	Notes
50100-HA5-000	Main Frame Assembly	Complete frame
50300-HA5-000	Front Fender	Red color
50400-HA5-000	Rear Fender	Red color
50700-HA5-000	Footpeg Assembly	Left and right
52100-HA5-000	Fuel Tank	3.4 gallon capacity

Suspension System

Front and rear suspension components including shocks, arms, and bushings.

Front Suspension: Independent double wishbone
Rear Suspension: Swingarm with dual shocks
Shock Absorbers: Front and rear specifications
A-arms & Bushings: Upper and lower control arms
Tie Rods & Ends: Steering linkage components

Drive Train

Shaft drive system components from engine to rear wheels.

Drive Shaft: Main and secondary shafts
Universal Joints: Front and rear U-joints
Differential: Rear gear assembly
Axles: Rear axle and splines
Bearings & Seals: Drive line bearings

CAUTION! Always check for proper lubrication of drive components.

Electrical System

Complete electrical components including wiring, switches, and charging system.

Component	Part Number	Function
Stator	31100-HA5-671	Charging system
CDI Unit	30410-HA5-671	Ignition control
Starter Motor	31200-HA5-671	Electric start
Voltage Regulator	31600-HA5-671	Voltage control
Headlight	33100-HA5-671	Front illumination

Brake System

Front and rear brake components including drums, shoes, and cables.

Front Brakes: Drum brake assembly
Rear Brakes: Drum brake with parking brake
Brake Shoes: Front and rear specifications
Brake Cables: Front and rear cable assemblies
Brake Levers: Handlebar controls

Maintenance Schedule

Recommended maintenance intervals for optimal performance.

Oil Change: Every 100 hours or 6 months
Oil Filter: Replace with every oil change
Air Filter: Clean every 50 hours, replace yearly
Spark Plug: Replace every 100 hours
Brake Inspection: Every 50 hours
Drive Shaft Lubrication: Every 200 hours
Wheel Bearing Service: Every 300 hours

Parts Replacement Guide

Step-by-step instructions for common parts replacement procedures.

Spark Plug Replacement: Remove old plug, gap new plug to 0.024", install and torque to 13 ft-lbs
Air Filter Service: Remove side cover, clean foam filter with solvent, re-oil and reinstall
Oil Change: Warm engine, drain oil, replace filter, refill with 2.1 quarts 10W-40
Brake Shoe Replacement: Remove wheel, replace shoes, adjust cable tension
Drive Chain Adjustment: Loosen axle nuts, adjust chain slack to 1-1.5 inches

Troubleshooting

Problem	Possible Cause	Solution
Engine won't start	Fuel, spark, or compression issue	Check fuel flow, spark plug, compression
Poor performance	Clogged air filter, dirty carburetor	Clean air filter and carburetor
Electrical failure	Battery, stator, or wiring issue	Test battery voltage, check connections
Brakes not working	Worn shoes, cable adjustment	Replace shoes, adjust cables
Vibration	Wheel balance, drive shaft issue	Balance wheels, check U-joints

Technical Support: Contact Honda customer service for genuine parts and technical assistance.