Class:
Mid-size sport naked motorcycle
Target Audience:
Enthusiasts seeking performance, reliability, and classic styling
Competitors:
Honda CB400F, Yamaha XJ400, Kawasaki GPZ400
Engine Type:
Four-cylinder, DOHC, air-cooled, providing smooth power delivery
Styling:
Classic naked bike design with muscular lines
Handling:
Balanced chassis and suspension for agile handling
Braking:
Effective dual front disc brakes for strong stopping power
Engine:
4-stroke, DOHC, Inline-4 cylinder, air-cooled
Fuel System:
Carburetor system (Mikuni VM26SS x 4)
Ignition System:
Electronic ignition (CDI)
Cooling System:
Air-cooled
Exhaust System:
2-into-4 exhaust configuration
Transmission:
6-speed constant mesh
Frame:
Steel, double-cradle
Suspension Front:
Telescopic fork, oil-damped
Suspension Rear:
Swing arm, twin shock absorbers with adjustable preload
Brakes Front:
Dual hydraulic disc brakes
Brakes Rear:
Hydraulic disc brake
Tires Front:
100/90-18 M/C 56H
Tires Rear:
130/90-17 M/C 64H
Electrical System:
12V system, electric start, battery ignition
Lighting:
Halogen headlight, LED tail light, incandescent turn signals
Engine Overhaul:
Complete disassembly, inspection, and reassembly
Carburetor Tuning:
Adjustment, cleaning, and rebuilding
Valve Adjustment:
Clearance checking and adjustment procedures
Transmission Repair:
Gearbox disassembly, repair, and assembly
Clutch Replacement:
Friction plate and steel plate replacement
Brake System Maintenance:
Fluid replacement, caliper service, pad replacement
Suspension Service:
Fork seal replacement, shock absorber service
Electrical Diagnostics:
Wiring diagrams, troubleshooting guides for electrical faults
Routine Maintenance:
Oil changes, filter replacements, spark plug checks
Body Panel Removal:
Fairings, tank, seat removal and installation
Wheel Bearing Service:
Inspection and replacement
Depth:
Comprehensive (from basic maintenance to full engine rebuilds and electrical diagnostics)
Engine Code:
GSX400FD (Specific engine variant may vary slightly)
Engine Type:
4-stroke, DOHC, 4 valves per cylinder
Displacement:
398 cc (24.3 cu in)
Bore X Stroke:
53.0 mm x 46.8 mm (2.09 x 1.84 in)
Horsepower Rating:
Approx. 40 HP @ 9,000 rpm
Torque Rating:
Approx. 32 Nm (23.6 lb-ft) @ 7,000 rpm
Carburetor Type:
Mikuni VM26SS (x4) constant velocity carburetors
Fuel Capacity:
16 L (4.2 US gal)
Fuel Type:
Unleaded gasoline (91-95 RON recommended)
Length:
Approx. 2,115 mm (83.3 in)
Width:
Approx. 750 mm (29.5 in)
Height:
Approx. 1,130 mm (44.5 in)
Wheelbase:
Approx. 1,430 mm (56.3 in)
Ground Clearance:
Approx. 145 mm (5.7 in)
Dry Weight:
Approx. 173 kg (381.4 lbs)
Wet Weight:
Approx. 188 kg (414.5 lbs)
Engine Oil Change:
Every 3,000 km (1,860 miles) or 6 months
Oil Filter Replacement:
Every 6,000 km (3,730 miles) or 12 months
Air Filter Cleaning:
Every 3,000 km (1,860 miles)
Spark Plug Replacement:
Every 6,000 km (3,730 miles)
Valve Clearance Check:
Every 6,000 km (3,730 miles)
Brake Fluid Replacement:
Every 12 months
Chain Lubrication:
Every 1,000 km (620 miles) or after washing/rain
Engine Oil Type:
API SE or SF, SAE 10W-40
Engine Oil Capacity:
2.6 L (2.7 US qt) with filter change
Fork Oil Type:
Genuine Suzuki Fork Oil SS-03 or equivalent SAE 10W
Fork Oil Capacity:
420 ml (14.2 US fl oz) per fork leg
Brake Fluid Type:
DOT 3 or DOT 4
Common Wear Items:
Clutch plates, brake pads, fork seals, wheel bearings
Carburetor Issues:
Can suffer from clogged jets and float bowl issues due to age and fuel deposits
Electrical Connections:
Corrosion in connectors and wiring can lead to intermittent issues
Manufacturer:
Suzuki Motor Corporation
Specialty:
Motorcycles, automobiles, marine engines
Predecessor:
GS400 series
Development Focus:
Modernized engine, improved chassis, enhanced performance for the early 1980s market
Production Years:
Early to mid-1980s (1983 model year is covered)
Manufacturing Location:
Japan