The Yamaha XJ550RH Seca, produced around 1981, is a mid-size naked sport-touring motorcycle characterized by its DOHC inline-four cylinder engine. With a displacement of 540 cc, it delivers approximately 53 horsepower and 30 lb-ft of torque, paired with a 6-speed manual transmission and chain drive. This model represents Yamaha's engineering prowess in the early 1980s, offering a blend of smooth power delivery and comfortable ergonomics suitable for both spirited riding and touring. Its design and performance placed it competitively within its segment, rivaling other Japanese manufacturers of the era. This comprehensive workshop service repair manual, written in English, provides detailed information for the Yamaha XJ550RH Seca. It covers all essential aspects of the vehicle, from routine maintenance procedures such as oil changes and spark plug checks to in-depth repair instructions for engine overhauls, carburetor rebuilding, and suspension servicing. The manual also includes vital troubleshooting guides, electrical system diagnostics, and technical specifications, making it an indispensable resource for owners, mechanics, and technicians seeking to maintain, repair, and optimize the performance and longevity of this classic motorcycle. 🏷️ Basic Information Identification Make: Yamaha Model: XJ550RH Seca Year: 1981 Codes Model Code: XJ550RH 👋 Introduction Market Position Segment: Sportbike/Standard Motorcycle Target Audience: Enthusiast owners, independent repair shops, aspiring motorcycle mechanics Competitive Analysis Key Competitors Era: Honda CB550/CB650, Kawasaki KZ550/KZ650, Suzuki GS550/GS650 Key Features Vehicle Class: Mid-size naked sport-touring motorcycle Engine Configuration: Inline-four cylinder Unique Selling Proposition: Yamaha's blend of smooth inline-four power delivery with sport-touring ergonomics 📋 Manual Details Coverage Areas Manual Scope: Complete Factory Service Repair Manual Page Count Page Count: Hundreds of pages Manual Type Manual Type: Workshop Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Service: Complete engine overhaul, disassembly, assembly, troubleshooting, specifications Fuel System: Carburetor tuning, fuel pump, fuel lines, fuel tank inspection and service Ignition System: Ignition timing, spark plugs, coils, CDI unit, troubleshooting Transmission Drive: Clutch operation, gear shifting mechanisms, final drive, troubleshooting Cooling System: Radiator, hoses, thermostat, coolant specifications, troubleshooting Electrical System: Wiring diagrams, battery, charging system (alternator/stator), lighting, starter motor, troubleshooting Suspension Steering: Front forks (telescopic), rear shock absorbers, steering head bearings, linkage, lubrication Braking System: Front and rear brake systems (likely disc front, drum rear), hydraulic components, fluid specifications, maintenance Frame Bodywork: Frame inspection, body panel removal and installation, fairing components, seat, fenders Wheels Tires: Wheel bearing service, tire pressure specifications, tire replacement Procedures Included Routine Maintenance: Oil changes, filter replacement, chain adjustment, lubrication points, spark plug checks Troubleshooting: Diagnostic procedures for common and uncommon issues across all systems Repair Procedures: Step-by-step instructions for component disassembly, repair, and reassembly Electrical Diagnostics: Troubleshooting electrical faults using wiring diagrams and test procedures Engine Rebuild: Detailed instructions for engine disassembly, component inspection, part replacement, and reassembly Carburetor Rebuild: Comprehensive guidance on cleaning, rebuilding, and synchronizing carburetors Suspension Overhaul: Instructions for servicing front forks and rear shock absorbers, including fluid changes and seal replacement Brake System Service: Bleeding procedures, pad/shoe replacement, caliper/wheel cylinder service Technical Depth Depth Level: Comprehensive: Covers everything from basic maintenance to complete engine rebuilds and complex diagnostics 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Printable (full or partial pages) Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: DOHC Inline-Four Cylinder Displacement: 550 cc (540 cc) Bore X Stroke: 58.0 mm x 50.7 mm Compression Ratio: 9.5:1 Performance Horsepower: Approx. 53 hp @ 9,000 RPM (Manufacturer Claim) Torque: Approx. 30 lb-ft @ 7,500 RPM (Manufacturer Claim) Fuel System Carburetion: Four Mikuni VM26SS Constant Velocity Carburetors Fuel Type: Unleaded gasoline Cooling System Cooling Method: Air-cooled 🔧 Transmission Standard Transmission Type: Constant Mesh 6-Speed Manual Features Clutch Type: Wet Multi-Plate Clutch Final Drive: Chain Drive 📐 Dimensions Exterior Length: Approx. 2,180 mm (85.8 in) Width: Approx. 760 mm (29.9 in) Height: Approx. 1,175 mm (46.3 in) Weights Dry Weight: Approx. 182 kg (401 lbs) Wet Weight: Approx. 199 kg (439 lbs) Wheels Tires Front Tire Size: 3.00-18 (or 100/90-18) Rear Tire Size: 120/90-17 Wheelbase: Approx. 1,435 mm (56.5 in) 🛡️ Safety Features Ratings Safety Standards: Designed to meet prevailing safety standards of the early 1980s Active Features Braking System Description: Hydraulic front disc brake, Mechanical rear drum brake Passive Features Lighting System: Halogen Headlight, Tail/Brake Lights, Turn Signals 💡 Technology Features Infotainment Instrumentation: Analog speedometer, tachometer, odometer, trip meter, fuel gauge, indicator lights (turn signals, neutral, oil pressure, high beam) Driver Assistance ABS: Not available Connectivity Connectivity Features: N/A (Early 1980s technology) 🔧 Maintenance Service Intervals Oil Change Interval: Recommended every 3,000 miles or 6 months (refer to manual for precise intervals) Valve Clearance Check: Recommended every 6,000 miles or 12 months (refer to manual for precise intervals) Spark Plug Replacement: Recommended based on inspection, typically every 10,000-12,000 miles Fluid Specifications Engine...