Bike Segment:
Entry-level to mid-range sportbike / naked bike category
Target Audience:
New riders, commuting, light sport touring
Competitors:
Kawasaki GPZ250R, Yamaha FZR250R, Honda CB-1
Engine Configuration:
Compact inline-four cylinder, liquid-cooled, DOHC
Styling:
Sporty yet accessible, often available in faired or unfaired variants
Manual Value Proposition:
Essential tool for owners and independent mechanics to maintain peak performance and longevity
Primary Coverage:
Comprehensive service, repair, and maintenance for the 1990 Suzuki GSX250F
Secondary Coverage:
Includes troubleshooting, adjustments, specifications, and diagnostic procedures
Estimated Pages:
Approx. 300-400 (typical for a full factory service manual of this era)
Type:
Factory Service Manual / Repair Manual
Format:
Likely digital (PDF) given modern sales, originally printed
Engine Mechanical:
Engine disassembly, assembly, inspection, overhaul, valve clearance, timing chain, piston, rings, crankshaft, connecting rods, lubrication system
Fuel System:
Carburetor (Mikuni VM series typical), fuel pump, fuel tank, fuel lines, fuel filter
Ignition System:
CDI ignition, spark plugs, ignition coils, stator, pickup coils
Cooling System:
Liquid cooling, radiator, fan, thermostat, water pump, coolant specifications
Transmission Drivetrain:
Gearbox, clutch operation, gear shifting mechanism, drive chain adjustment and maintenance
Brakes:
Front and rear brake systems (likely hydraulic disc), brake caliper overhaul, master cylinder, brake fluid specifications
Suspension:
Front telescopic forks, rear monoshock or twin shocks, fork oil specifications, rear suspension adjustments
Wheels Tires:
Wheel bearing maintenance, tire pressure specifications, wheel balancing
Electrical System:
Wiring diagrams, battery specifications, lighting system, charging system (alternator/stator), starter motor, fuses, relays, horn
Frame Bodywork:
Frame inspection, fairing removal and installation, seat, fuel tank mounting, handlebars, footpegs
Diagnostics Troubleshooting:
Common problems and solutions, fault finding charts, diagnostic procedures for electrical and mechanical issues
Routine Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, spark plug replacement, air filter cleaning/replacement
Major Overhauls:
Engine rebuilds, transmission overhauls, carburetor tuning and rebuilding, suspension rebuilds
Adjustments:
Carburetor synchronization, idle speed adjustment, clutch and throttle cable free play, brake lever adjustment
Component Replacement:
Replacement procedures for all major components including engine parts, electrical components, and body panels
Electrical Diagnostics:
Wiring harness tracing, testing of electrical components (coils, CDI, stator), troubleshooting electrical faults
Depth:
Comprehensive factory-level detail, suitable for professional mechanics and advanced DIY enthusiasts
Detail Level:
Includes torque specifications, clearances, measurements, and precise assembly sequences
Engine Type:
Inline-four cylinder, 4-stroke, DOHC, 16-valve
Displacement:
249 cc (Cubic Centimeters)
Bore X Stroke:
Approx. 49.0 mm x 64.4 mm (typical for GSX-R/F series of this era)
Compression Ratio:
Approx. 11.5:1 to 12.0:1
Horsepower Rating:
Typically around 35-40 PS (Pferdestärke) / HP at ~11,000-12,000 RPM (JDM spec, may vary by market)
Torque Rating:
Around 2.4 - 2.6 kgf·m / 23-25 Nm at ~9,000-10,000 RPM
Carburetor Type:
Dual Mikuni VM30SS or similar CV (Constant Velocity) carburetors
Fuel Tank Capacity:
Approx. 13 Liters (2.86 US gal)
Coolant Type:
Ethylene glycol-based coolant (e.g., Suzuki's specific blend or equivalent 50/50 mix with distilled water)
Oil Change Interval:
Every 3,000-5,000 km or 6-12 months (refer to manual for precise recommendation)
Air Filter Service:
Check every 3,000 km, clean/replace as needed (more frequently in dusty conditions)
Spark Plug Replacement:
Every 10,000-15,000 km (refer to manual for specific plug type and gap)
Valve Clearance Check:
Every 6,000-12,000 km (critical for engine health)
Engine Oil Capacity:
Approx. 2.0 - 2.3 Liters with filter change (refer to manual)
Brake Fluid Type:
DOT 3 or DOT 4 (refer to manual for specific recommendation)
Fork Oil Type:
SAE 10W (or equivalent) - capacity specified per fork leg
Carburetor Issues:
Clogged jets, vacuum leaks, sticky slides due to age and fuel deposits.
Electrical Issues:
Corroded connectors, faulty rectifiers/regulators, weak charging systems.
Cooling System Issues:
Leaking hoses, failing water pump seals, clogged radiators.
Clutch Wear:
Fading clutch performance or slipping due to worn friction plates.
