🏷️ Basic Information

Make:

Suzuki

Model:

GSX250F

Year:

1991

Generation Designation:

First Generation (GJ74A chassis code)

Chassis Code:

GJ74A

Engine Code:

G503

👋 Introduction

Motorcycle Segment:

Lightweight sportbike / naked sportbike.

Target Audience:

Riders seeking an accessible, sporty, and reliable motorcycle for commuting and recreational riding.

Key Competitors 1991:

Honda CB-1, Yamaha FZX250 Zephyr, Kawasaki GPX250-R (250cc class sportbikes).

Engine Type:

Liquid-cooled, DOHC, inline-four cylinder.

Styling:

Sporty faired design reminiscent of larger GSX-R models of the era.

Handling:

Designed for agile and responsive handling.

📋 Manual Details

Manual Type:

Factory Service Repair Manual

Language:

English

Format:

Digital (likely PDF based on description)

Estimated Page Count:

200-400 pages (typical for factory service manuals of this era)

📖 Manual Coverage

Engine Mechanical:

Disassembly, assembly, inspection, and repair of all engine components including cylinder head, valves, pistons, crankshaft, lubrication system, and cooling system.

Fuel System:

Carburetor inspection, adjustment, and overhaul; fuel tank and fuel line maintenance.

Transmission Drivetrain:

Clutch operation, gearbox disassembly and assembly, chain drive maintenance and adjustment.

Electrical System:

Ignition system testing and repair, lighting system, starter motor, battery, charging system (alternator/stator), and wiring diagrams.

Braking System:

Front and rear brake caliper maintenance, hydraulic system bleeding, brake pad replacement, and disc inspection.

Suspension Steering:

Front fork disassembly, seal replacement, oil levels; rear shock absorber adjustment and replacement; steering head bearing maintenance.

Chassis Frame:

Frame inspection, bodywork removal and installation, seat, and tank mounting.

Wheels Tires:

Wheel bearing inspection and replacement, tire pressure checks, and wheel balancing (if applicable).

Preventative Maintenance:

Scheduled maintenance tasks, oil changes, filter replacements, and lubrication points.

Troubleshooting:

Diagnostic procedures for common problems and fault finding with detailed symptom analysis.

Repair Procedures:

Step-by-step instructions for component removal, disassembly, repair, reassembly, and installation.

Adjustment Procedures:

Carburetor synchronization, ignition timing, chain slack, and clutch lever free play adjustments.

Technical Specifications:

Detailed torque specifications, clearances, fluid capacities, and electrical component values.

Depth Of Coverage:

Comprehensive, covering routine maintenance to complete engine and chassis overhauls.

Diagnostic Information:

Includes diagnostic flowcharts and component testing procedures.

📊 Manual Specifications

File Type:

PDF (standard for digital manuals)

Searchability:

Likely searchable text content for easy navigation.

Clarity Of Diagrams:

High-resolution diagrams and illustrations as expected from factory documentation.

Binding Method:

N/A (for digital format)

Paper Quality:

N/A (for digital format)

⚙️ Engine Specifications

Engine Type:

360 degrees inline-four cylinder, four-stroke, DOHC, 16 valves.

Displacement:

249 cc (249cc)

Bore X Stroke:

53.0 mm x 53.0 mm

Compression Ratio:

11.0:1

Cooling System:

Liquid-cooled

Valve Train:

DOHC, 4 valves per cylinder

Horsepower Ps:

Approx. 35 PS (25.7 kW) at 12,000 RPM (estimated, actual figures may vary by market)

Torque Nm:

Approx. 24 Nm (17.7 lb-ft) at 10,000 RPM (estimated, actual figures may vary by market)

Carburetion:

Mikuni VM22SS x 4 (Four Mikuni constant velocity carburetors)

Fuel Tank Capacity:

12 Liters (3.17 US Gallons)

Oil Type:

SAE 10W-40 API SE or SF (refer to manual for exact specification)

Oil Capacity With Filter Change:

Approx. 1.7 Liters (refer to manual for exact specification)

🔧 Transmission

Transmission Type:

6-speed constant mesh

Clutch Type:

Wet, multi-plate

Final Drive:

O-ring sealed chain

Gear Ratios:

Refer to manual for specific gear ratios.

Transmission Oil Type:

API GL-4 SAE 80 or 90 (refer to manual for exact specification)

📐 Dimensions

Overall Length:

Approx. 2010 mm (79.1 in)

Overall Width:

Approx. 750 mm (29.5 in)

Overall Height:

Approx. 1070 mm (42.1 in)

Wheelbase:

Approx. 1375 mm (54.1 in)

Dry Weight:

Approx. 147 kg (324 lbs)

Wet Weight:

Approx. 158 kg (348 lbs) (with fluids)

Maximum Load:

Refer to manual for specific rider and cargo load limits.

🛡️ Safety Features

Crash Test Ratings:

Not applicable to motorcycles in the same way as cars; focus is on rider protection and vehicle stability.

Braking System Front:

Hydraulic disc brake (dual piston caliper)

Braking System Rear:

Hydraulic disc brake (single piston caliper)

Lighting:

Halogen headlamp, tail lamp, turn signals.

Frame Construction:

Steel diamond frame for rigidity and rider confidence.

Tires Front:

110/70-17

Tires Rear:

130/70-17

Wheel Type:

Cast alloy wheels

💡 Technology Features

Infotainment Features:

Basic analog instrumentation: speedometer, tachometer, odometer, trip meter, coolant temperature gauge, neutral indicator, turn signal indicators.

Driver Assistance Systems:

None.

Connectivity Features:

None.

🔧 Maintenance

Engine Oil Change:

Every 3,000 km (1,860 miles) or 6 months, whichever comes first.

Oil Filter Replacement:

Every 6,000 km (3,730 miles) or 12 months (recommended with oil change).

Air Filter Cleaning:

Every 3,000 km (1,860 miles), clean and re-oil if applicable.

Spark Plug Replacement:

Every 6,000 km (3,730 miles).

Chain Lubrication Adjustment:

Every 1,000 km (620 miles).

Engine Oil Specification:

SAE 10W-40 API SE or SF

Coolant Type:

Ethylene glycol based antifreeze coolant (50/50 mixture with distilled water)

Brake Fluid Type:

DOT 3 or DOT 4 hydraulic brake fluid

Carburetor Synchronization:

Can require periodic adjustment for smooth running and optimal fuel mixture.

Charging System Reliability:

Stator or rectifier issues can sometimes occur with age, affecting battery charging.

Cam Chain Tensioner:

Early models may exhibit cam chain noise; manual details inspection and adjustment/replacement.

Fork Seal Replacement:

A common wear item requiring seal and oil replacement.

📚 Vehicle History

Suzuki Motorcycles:

Suzuki has a long and rich history in motorcycle manufacturing, known for innovation and performance across various classes, from small displacement bikes to super sports and off-road machines.

Gsx Series Legacy:

The GSX branding has historically been associated with Suzuki's high-performance, four-cylinder sportbikes, evolving from the early GS series to the modern GSX-R line.

Gsx250F Positioning:

The GSX250F (GJ74A) was positioned as an entry-level sportbike, offering the sporty looks and feel of its larger siblings in a more accessible package for younger riders or those in markets with displacement restrictions.

Production Years:

The GJ74A chassis GSX250F was produced primarily in the early to mid-1990s.

Manufacturing Location:

Japan

🏆 Awards & Recognition

Awards Received:

No specific widely publicized awards for the GSX250F model itself, as it was part of a segment focused on practical sporty performance rather than racing homologation or critical acclaim of the time.

Reliability Reputation:

Generally considered reliable if properly maintained, typical of Suzuki's inline-four engines from that era.