Segment:
Sport-touring motorcycle, offering a blend of performance and comfort for its era.
Competitors:
Competed with models from Honda (e.g., VF500C/F Magna/Interceptors), Kawasaki (e.g., GPz550), and Suzuki (e.g., GS550).
Engine Configuration:
Distinctive 70-degree V-twin engine layout, uncommon in its class for the time, contributing to its unique styling and sound.
Styling:
Modern (for the 1980s) styling with integrated fairing, dual headlights, and a sporty profile.
Suspension:
Advanced for its time, featuring an air-assisted front fork and a sophisticated mono-shock rear suspension system.
Engine Service:
Complete Engine Rebuild and Tuning
Chassis Service:
Suspension, Steering, Brakes, Wheels, Tires
Electrical Service:
Ignition System, Lighting, Wiring Diagrams, Starting and Charging
Fuel System Service:
Carburetor Overhaul, Fuel Pump, Fuel Lines
Maintenance:
Scheduled Maintenance, Lubrication, Adjustments
Troubleshooting:
Diagnostic Procedures for Common Issues
Type:
Workshop Service Manual
Language:
English (Implied by typical publication for mechanical technicians)
Engine:
550cc V-Twin, four-stroke, DOHC, air-cooled engine specifications, disassembly, assembly, inspection, and repair procedures.
Transmission:
Six-speed constant mesh gearbox, clutch assembly, gear shift mechanism details, and service procedures.
Brakes:
Front and rear disc brake systems, hydraulic components, caliper overhaul, pad replacement, and fluid specifications.
Suspension:
Front telescopic fork (including air assist) and rear mono-shock suspension system, damper service, spring replacement, and adjustment procedures.
Electrical:
Full wiring diagrams, ignition timing, charging system (stator, regulator/rectifier), starter motor, lighting circuits, and component testing.
Fuel System:
Twin Mikuni VM34 carburetors, jetting specifications, float bowl adjustment, diaphragm inspection, and fuel pump service.
Cooling System:
Air-cooling system component details and cleaning recommendations.
Exhaust System:
Exhaust pipe and muffler inspection and replacement.
Frame And Bodywork:
Frame inspection, swingarm disassembly, body panel removal and installation, and fasteners.
Engine Rebuild:
Detailed step-by-step instructions for complete engine disassembly, inspection of wear components (pistons, rings, cylinders, valves), bearing replacement, crankshaft service, and reassembly.
Carburetor Tuning:
Procedures for synchronizing carburetors, adjusting idle speed, and troubleshooting common fuel delivery issues.
Valve Adjustment:
Specific instructions for checking and adjusting valve clearances, including required tools and torque specifications.
Brake Bleeding:
Correct procedure for bleeding hydraulic brake systems to ensure optimal performance.
Electrical Diagnostics:
Flowcharts and step-by-step guides for diagnosing electrical faults using a multimeter and referencing wiring diagrams.
Suspension Fork Service:
Detailed instructions for fork seal replacement, oil changes, and air pressure adjustments.
Diagnostics:
Advanced diagnostic procedures for identifying the root cause of performance issues, electrical faults, and mechanical problems.
Repair Procedures:
Comprehensive repair instructions for virtually all mechanical and electrical components of the motorcycle.
Specifications:
Inclusion of critical technical data, tolerances, torque values, and measurements for accurate servicing.
Special Tools:
Identification of any specific or special tools required for certain repair procedures.
Engine Type:
Four-stroke, DOHC, V-twin
Bore X Stroke:
72.0 mm x 67.0 mm
Cooling System:
Air-cooled
Horsepower At Rpm:
Approx. 60 PS (44 kW) at 9,000 rpm (est. for Japanese spec)
Torque At Rpm:
Approx. 48 Nm (35 lb-ft) at 7,500 rpm (est. for Japanese spec)
Carburetors:
2 x Mikuni VM34 (flat-slide)
Fuel Capacity:
18 L (4.8 US gal)
Oil Capacity:
3.2 L (3.4 US qt) with filter change
Recommended Oil Grade:
Yamalube 20W-40 or equivalent (API SE, SF)
Crash Test Ratings:
N/A (Motorcycle, pre-dates standardized motorcycle crash testing)
Braking System:
Dual front disc brakes, single rear disc brake, hydraulic actuation.
Lighting:
Halogen headlight, tail light, turn signals.
Frame Construction:
Steel frame designed for stability and handling.
Oil Change Interval:
Every 4,000 km (2,500 miles) or 6 months
Air Filter Cleaning:
Every 4,000 km (2,500 miles)
Spark Plug Replacement:
Every 8,000 km (5,000 miles)
Valve Clearance Check:
Every 16,000 km (10,000 miles)
Brake Fluid Type:
DOT 3 or DOT 4
Fork Oil Type:
Yamaha Suspension Fluid 10W or equivalent
Final Drive Oil Type:
Yamaha Hypoid Gear Oil 80W-90 or equivalent
Carburetor Issues:
Potential for carburetor gumming due to fuel evaporation and vacuum diaphragm cracking over time, affecting fuel delivery.
Electrical Connections:
Corrosion or looseness in electrical connectors, especially at the regulator/rectifier, can lead to charging system problems.
Suspension Seals:
Front fork seals are prone to wear and leakage over time, requiring replacement.
Exhaust Flange Leaks:
Exhaust header flange gaskets can sometimes fail, leading to exhaust leaks and a loss of performance.
