Market Segment:
Lightweight Supersport / Sportbike
Competitors:
Honda CBR400RR, Suzuki GSX-R400, Kawasaki ZXR400
Distinguishing Features:
Compact and high-revving inline-four engine, lightweight chassis, performance-oriented suspension and braking components, often featuring adjustable suspension for track use. The 'SP' designation implies a higher-spec or performance-oriented version.
Systems:
Engine, Fuel System, Ignition System, Cooling System, Transmission, Clutch, Brakes, Suspension (Front & Rear), Wheels & Tires, Electrical System, Frame, Chassis, General Maintenance, Settings & Adjustments, Troubleshooting
Fuel System Details:
Carburetor removal, cleaning, adjustment, fuel pump operation, fuel filter replacement.
Ignition System Details:
Ignition timing, coil resistance, spark plug specifications, troubleshooting of CDI unit.
Electrical System Details:
Wiring diagrams, charging system (stator, regulator/rectifier), battery maintenance, starter system, lighting, fuses.
Procedures:
Routine Maintenance, Engine Disassembly, Engine Overhaul, Engine Reassembly, Suspension Overhaul, Brake System Servicing, Clutch Adjustment and Repair, Electrical System Diagnosis and Repair, Fuel System Servicing, Ignition System Tuning, Cooling System Maintenance, Lubrication Procedures, Torque Specifications, Specific Tool Usage, Performance Data, Weights, Overall Dimensions, Fluid Topping Procedures
Engine Rebuild Procedures:
Detailed steps for piston removal/installation, ring replacement, crankshaft and connecting rod inspection, valve lapping, camshaft installation, bearing replacement, and gasket renewal.
Suspension Procedures:
Front fork disassembly, oil change, seal replacement, spring inspection. Rear shock absorber inspection and replacement (if applicable, depending on SP model specifics).
Depth:
Professional technician level, covering everything from basic adjustments to complete engine rebuilds and in-depth diagnostics.
Diagnostic Capabilities:
Includes troubleshooting charts and common problem identification for engine performance, electrical faults, and chassis issues.
Special Tools Required:
Manual lists specific tools required for various procedures, such as torque wrenches, piston ring compressors, specialized pullers, and engine service stands.
Engine Type:
Inline-Four Cylinder, DOHC, 16-valve
Bore X Stroke:
Refer to manual, typically around 56.0 mm x 40.5 mm.
Compression Ratio:
Refer to manual, likely around 11.0:1 or higher.
Horsepower:
Approximately 53-59 PS (depending on market regulations).
Torque:
Refer to manual for exact figures, typically around 35-38 Nm.
Carburetion:
Mikuni CV Carburetors (likely 34mm or similar) with electronic jetting control for some models.
Fuel Type:
Unleaded gasoline, minimum 91 octane (RON+MON)/2.
Cooling Method:
Liquid-cooled
Ignition Type:
Digital CDI (Capacitor Discharge Ignition)
Overall Length:
Refer to manual for exact dimensions.
Overall Width:
Refer to manual for exact dimensions.
Overall Height:
Refer to manual for exact dimensions.
Dry Weight:
Approximately 165-170 kg.
Wet Weight:
Approximately 185-190 kg (with fluids).
Fuel Capacity:
Refer to manual, typically around 15-16 liters.
Oil Capacity:
Refer to manual, typically around 3.0-3.5 liters with filter change.
Oil Change Interval:
Refer to manual, typically every 3,000-5,000 km or annually. Use Yamalube or equivalent specification oil.
Spark Plug Replacement:
Refer to manual, typically around 10,000-15,000 km. Recommended plugs: NGK CR9E or similar.
Air Filter Cleaning Replacement:
Refer to manual, inspect periodically, clean or replace as needed based on riding conditions.
Chain Lubrication Adjustment:
Regularly, based on mileage and riding conditions. Refer to manual for specific chain slack specifications.
Coolant Flush Interval:
Refer to manual, typically every 2 years or 20,000 km.
Engine Oil Type:
Refer to manual for viscosity grade (e.g., 10W-40) and API classification (e.g., SG or higher).
Coolant Type:
Ethylene Glycol based antifreeze/coolant with corrosion inhibitors, mixed 50/50 with distilled water.
Clutch Fluid Type:
Refer to manual; if hydraulic, likely DOT 4.
Fork Oil Type Viscosity:
Refer to manual for specific type and viscosity (e.g., SAE 10W).
Common Wear Items:
Carburetor synchronization and cleaning, clutch wear, fork seal leaks, stator and rectifier issues (common in many bikes of this era).
Common Performance Issues:
Loss of power due to carburetor or fuel delivery issues, electrical gremlins in the wiring harness over time.
Heritage Context:
Yamaha has a long-standing history of producing high-performance sport motorcycles, with the FZR series being a significant line in the late 1980s and early 1990s, known for their advanced technology for the era.
Evolution:
The FZR400 series underwent several iterations, with the SP model representing a more performance-focused variant, often featuring upgraded suspension and braking components compared to the standard FZR400.
Production Period:
Mid-to-late 1980s and early 1990s.
