Target Audience:
Suzuki GN400 owners, DIY enthusiasts, independent mechanics, and dealership technicians.
Differentiation:
Vehicle-specific, factory-quality information, unlike generic repair guides.
Content Style:
Step-by-step instructions, diagrams, specifications, and wiring schematics.
Ease Of Use:
Designed for ease of use, enabling users to perform repairs with confidence.
Authenticity:
Represents the same information used by professional technicians.
Engine System:
Detailed repair, restoration, and maintenance procedures for the GN400 engine.
Fuel System:
Carburetor tuning, fuel delivery, and related components.
Ignition System:
Ignition timing, spark plug specifications, and troubleshooting.
Exhaust System:
Exhaust pipe and muffler maintenance and repair.
Transmission System:
Gearbox operation, clutch adjustment, and related components.
Drivetrain System:
Chain drive maintenance, sprockets, and related components.
Braking System:
Front and rear brake system maintenance, adjustment, and component replacement.
Suspension System:
Front fork and rear shock absorber servicing and adjustment.
Electrical System:
Wiring schematics, lighting system, charging system, and battery maintenance.
Frame And Bodywork:
Frame inspection, body panel removal and installation.
Wheels And Tires:
Tire pressure, wheel balancing, and spoke tensioning.
Controls And Instruments:
Handlebar controls, instrument panel operation and repair.
Maintenance Procedures:
Regular servicing, lubrication, filter changes, and fluid checks.
Troubleshooting Guides:
Step-by-step diagnostic procedures for common and complex issues.
Repair Procedures:
Detailed instructions for component disassembly, repair, and reassembly.
Restoration Guides:
Guidance for bringing older or damaged vehicles back to operational status.
Component Replacement:
Instructions for replacing worn or damaged parts across all systems.
Depth Level:
Covers everything from very simple repairs to complex ones, suitable for DIY enthusiasts and professionals.
Expertise Level:
No technical expertise required due to clear instructions and illustrations.
Engine Type:
4-stroke, SOHC, Single Cylinder (details likely within the manual)
Engine Displacement:
398cc (for most GN400 models, precise year variations possible)
Bore X Stroke:
Specifics available in manual (typical for this era: ~82mm x 74.4mm)
Compression Ratio:
Specifics available in manual (typical for this era: ~8.2:1)
Horsepower:
Details in manual (typically around 26-30 HP)
Torque:
Details in manual (typically around 30-33 Nm)
Carburetion:
Likely a Mikuni VM series carburetor (specific model in manual, e.g., VM32SS)
Fuel Type:
Unleaded gasoline (recommendation in manual)
Oil Change Interval:
Refer to manual for specific mileage/time intervals (typically 3,000-5,000 km or 6-12 months).
Spark Plug Replacement:
Refer to manual for recommended intervals and types.
Chain Lubrication Adjustment:
Recommended at regular intervals, especially after washing or riding in wet conditions.
Engine Oil Type:
Refer to manual for specific viscosity grade and API classification (e.g., SAE 10W-40 API SE or SF).
Engine Oil Capacity:
Refer to manual for capacity (typically around 2.0-2.5 liters with filter change).
Brake Fluid Type:
Refer to manual for DOT specification (likely DOT 3 or DOT 4).
Fork Oil Type:
Refer to manual for viscosity and quantity.
Common Wear Items:
Clutch wear, carburation issues due to age, front fork seal leaks, electrical connection corrosion.
Performance Degradation:
Loss of power due to worn piston rings, valve seat wear, or clogged carburetors.
Electrical Failures:
Stator or rectifier failure, wiring harness degradation.
Manufacturer:
Suzuki Motor Corporation, Japan
Model Line:
The GN series was part of Suzuki's line of versatile, relatively lightweight motorcycles, often styled as 'cruisers' or 'standards'.
Production Era:
The GN400 was primarily produced in the early to mid-1980s (e.g., 1983-1985 models are common).
Manufacturing Location:
Japan (typically for Suzuki motorcycles of this era)
