Target Audience:
Owners and mechanics of the 1985 Suzuki GSX-R400 GK71B seeking to perform maintenance, repair, and diagnostics.
Value Proposition:
Provides factory-level repair information at a fraction of the cost of dealership services, enabling DIY maintenance and extending the life of the motorcycle.
Features:
Easy-to-read text, high-quality diagrams, step-by-step instructions, exploded pictures, comprehensive coverage.
Primary Coverage:
Complete service, repair, and workshop procedures
Estimated Pages:
Detailed page count not specified, but indicated as comprehensive covering complete disassembly.
Type:
Factory Service Repair Workshop Manual
Engine:
Detailed overhaul, inspection, tuning, and component replacement
Fuel System:
Carburetor settings, fuel pump, fuel lines, and filtration
Lubrication System:
Oil pump, oil passages, oil filter, and oil change procedures
Cooling System:
Radiator, fan, coolant flow, thermostat, and water pump
Chassis:
Frame, suspension (front forks, rear shock absorber), steering, swingarm, wheels, and brakes
Electrical System:
Ignition system, lighting, charging system (stator, regulator/rectifier), starter motor, battery, wiring diagrams, and component testing
Maintenance:
Periodic maintenance, tune-ups, fluid changes, and general servicing
Repair:
Step-by-step repair instructions for all major components and systems
Troubleshooting:
Diagnostic procedures and common issue resolution
Disassembly Assembly:
Complete disassembly and reassembly instructions with exploded views
Depth:
Comprehensive, suitable for both DIY enthusiasts and experienced mechanics, with detailed diagrams and instructions for complete machine disassembly.
Engine Type:
Liquid-cooled, 4-stroke, DOHC, 4-cylinder
Displacement:
398 cc (24.3 cu. in.)
Bore X Stroke:
53.0 mm x 45.2 mm (2.09 in x 1.78 in) - typical for this model, refer to manual for exact specification
Horsepower:
Approx. 59 HP (44 kW) at 11,000 RPM (specifications vary by market, refer to manual for precise figure)
Torque:
Approx. 39 Nm (29 lb-ft) at 10,000 RPM (specifications vary by market, refer to manual for precise figure)
Carburetors:
Likely Mikuni CV-type carburetors (e.g., 32mm), refer to manual for exact model and configuration
Fuel Capacity:
Approx. 16 Liters (4.2 US gal), refer to manual for precise specification
Length:
Approx. 2065 mm (81.3 in), refer to manual for exact specification
Width:
Approx. 720 mm (28.3 in), refer to manual for exact specification
Height:
Approx. 1160 mm (45.7 in), refer to manual for exact specification
Dry Weight:
Approx. 170 kg (375 lbs), refer to manual for exact specification
Wet Weight:
Approx. 186 kg (410 lbs), refer to manual for exact specification
Instrumentation:
Analog tachometer, speedometer, fuel gauge, temperature gauge, and indicator lights. Likely lacks modern infotainment systems.
Features:
No electronic rider aids such as ABS or traction control; features are focused on core motorcycle performance.
Oil Change:
Typically every 3,000-5,000 km (2,000-3,000 miles) or annually, refer to manual for exact interval and oil type.
Valve Clearance:
First check typically at 6,000-10,000 km, then periodically thereafter. Refer to manual for precise intervals and specifications.
Engine Oil:
Refer to manual for specific viscosity (e.g., SAE 10W-40, API SG or higher) and capacity.
Coolant:
Mixture of ethylene glycol and distilled water, refer to manual for ratio and capacity.
Brake Fluid:
DOT 3 or DOT 4, refer to manual for specific type and replacement interval.
Common Wear Items:
Clutch wear, carburetor synchronization issues, fork seal leaks, timing chain noise, electrical connections (especially starter solenoid).
Typical Maintenance Focus:
Regular carburetor cleaning and synchronization, checking valve clearances, and ensuring proper cooling system function are critical for longevity.
Manufacturer:
Suzuki Motor Corporation
Gsx R Lineage:
The 1985 GSX-R400 GK71B is an early model in Suzuki's highly influential GSX-R sportbike line, known for its race-inspired design and performance focus. It predates the more widely known GSX-R750 and GSX-R1100 models.
Initial Production:
1984 (internally) / 1985 (market release for GK71B)
Market Availability:
Primarily Japan and select European markets; less common in North America.
