The 1987 Suzuki Quadrunner 250 is a reliable four-wheel ATV featuring a 246cc four-stroke single-cylinder engine, automatic transmission with high/low range, shaft drive, front and rear suspension, electric start, and comprehensive instrumentation. This service manual covers maintenance procedures, specifications, troubleshooting, and repair guidelines for optimal performance and longevity.
Overview of the 1987 Suzuki Quadrunner 250 ATV, including model identification, safety precautions, and general maintenance guidelines.
| Component | Description |
|---|---|
| Model Code | LT250F |
| Vehicle Type | All-Terrain Vehicle (ATV) |
| Recommended Fuel | Regular unleaded (87 octane) |
| Oil Capacity | 1.6 quarts (1.5 liters) |
| Transmission Fluid | 10W-40 motor oil |
| Curb Weight | 386 lbs (175 kg) |
| Load Capacity | 220 lbs (100 kg) |
| Towing Capacity | Not recommended |
Regular maintenance schedule for optimal performance and safety.
WARNING! Always perform maintenance in well-ventilated area. Use proper safety equipment.
Detailed procedures for engine maintenance and repair.
| Service Item | Specification |
|---|---|
| Spark Plug | NGK DR8ES, gap 0.028-0.031 in |
| Valve Clearance (cold) | Intake: 0.002-0.003 in, Exhaust: 0.003-0.004 in |
| Idle Speed | 1400 ± 100 rpm |
| Compression Pressure | 142-171 psi at 400 rpm |
| Oil Pressure | 4.3-5.7 psi at 3000 rpm |
Torque Specifications: Cylinder head bolts: 20 ft-lbs, Spark plug: 13 ft-lbs, Oil drain plug: 22 ft-lbs
Carburetor specifications and service procedures.
CAUTION! Gasoline is highly flammable. Work in well-ventilated area away from ignition sources.
Electrical specifications and troubleshooting guide.
Testing Procedures: Battery voltage: 12.6V (fully charged), Charging output: 13.5-14.5V at 3000 rpm
Transmission and final drive maintenance.
WARNING! Never operate with damaged drive components. Replace worn parts immediately.
Suspension settings and steering maintenance.
| Component | Specification |
|---|---|
| Front Shock Preload | 5-position adjustable |
| Rear Shock Preload | 5-position adjustable |
| Steering Stem Bearings | Tapered roller bearings |
| Wheel Alignment | 0° toe-in |
| Tire Pressure (front) | 3.6 psi (25 kPa) |
| Tire Pressure (rear) | 3.6 psi (25 kPa) |
Brake system specifications and service procedures.
CAUTION! Always test brakes after service before riding.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Engine won't start | Fuel, spark, or compression issue | Check fuel flow, spark plug, compression |
| Poor performance | Clogged air filter, dirty carburetor | Clean/replace air filter, clean carburetor |
| Transmission slipping | Worn CVT belt, low fluid | Replace belt, check fluid level |
| Electrical failure | Dead battery, blown fuse | Charge/replace battery, check fuses |
| Brakes dragging | Stuck caliper, contaminated fluid | Clean caliper, flush brake fluid |
| Overheating | Low oil, clogged cooling fins | Check oil level, clean cooling fins |
Complete electrical schematics for the 1987 Suzuki Quadrunner 250.
Key Circuits: Starting system, charging system, lighting system, ignition system
Color Codes: R=Red, B=Black, W=White, G=Green, Y=Yellow, Br=Brown, Lg=Light Green
Connector Locations: Under seat, behind headlight, near battery
Service Support: For technical assistance, contact Suzuki customer service or authorized dealer.