The Yamaha XJ550RH Seca, produced around 1981, represents a notable entry in the sportbike and sport-touring segment of its era. This model, part of Yamaha's XJ series, was engineered to offer a blend of performance and comfort, distinguished by its compact and potent four-cylinder inline engine and a sportier aesthetic featuring a bikini fairing. With a 552 cc displacement and an estimated 53 horsepower, it provided capable performance for its class, competing with models from Honda, Kawasaki, and Suzuki. Its design philosophy focused on smooth power delivery and reliability, characteristic of Yamaha's commitment to quality engineering. This comprehensive Factory Service Repair Manual in English provides detailed guidance for the complete maintenance and repair of the Yamaha XJ550RH Seca. It covers all essential systems, including the engine, fuel system, ignition, drivetrain, electrical components, suspension, brakes, wheels, and bodywork. The manual details routine maintenance procedures, troubleshooting common issues, and major repair overhauls, offering in-depth technical specifications and diagnostic steps. This resource is designed to assist owners, mechanics, and technicians in effectively maintaining, troubleshooting, and repairing the vehicle, ensuring its optimal performance and longevity. 🏷️ Basic Information Identification Make: Yamaha Model: XJ550RH Seca Year: 1981 Codes Internal Chassis Code: XJ550RH 👋 Introduction Market Position Segment: Sportbike/Sport-Touring Competitive Analysis Competitors 1981: Honda CB550F/K, Kawasaki KZ550, Suzuki GS550 Key Features Design Philosophy: Blend of performance, comfort, and style, featuring a compact and potent inline-four engine. Distinctive Styling: Seca model featured a distinctive bikini fairing and sportier ergonomics compared to the standard XJ550. 📋 Manual Details Coverage Areas Coverage: Complete Factory Service and Repair Page Count Page Count: Hundreds of Pages (estimated 300-500 for typical 1981 Japanese motorcycle factory manuals) Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Complete engine teardown, assembly, diagnostics, tuning, and component specifications. Fuel System: Carburetor removal, cleaning, adjustment, synchronization, and fuel tank/petcock service. Ignition System: Ignition timing, coil testing, CDI unit diagnostics, spark plug specifications. Drivetrain: Clutch operation, gearbox inspection, drive shaft lubrication, final drive maintenance. Electrical System: Wiring diagrams, battery service, charging system (stator, regulator/rectifier), lighting, instrumentation, starter motor. Suspension And Steering: Front fork disassembly, service, and oil specifications; rear shock absorber inspection and replacement; steering bearing service. Braking System: Front and rear brake caliper service, master cylinder overhaul, hydraulic line inspection, brake pad replacement. Wheels And Tires: Wheel bearing service, tire pressure recommendations, rim inspection. Frame And Bodywork: Frame inspection, body panel removal/installation, seat maintenance, fairing components. Procedures Included Routine Maintenance: Oil change, filter replacement, chain adjustment, air filter cleaning/replacement, spark plug replacement, brake fluid flush, coolant service. Troubleshooting: Diagnostic charts for common performance issues, electrical faults, and starting problems. Major Repairs: Engine rebuilds, transmission overhauls, carburetor rebuilding, suspension component replacement. Electrical Diagnostics: Step-by-step diagnostic procedures using multimeter and specified test procedures. Technical Depth Depth: Comprehensive, covering all aspects from basic rider maintenance to full workshop-level overhauls. 📊 Manual Specifications File Format File Type: Digital (PDF) Print Quality Printability: High-resolution, suitable for printing individual sections or the entire manual. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Four-stroke, DOHC, air-cooled, inline four-cylinder Displacement: 552 cc (33.7 cubic inches) Bore X Stroke: 58.0 mm x 52.0 mm (2.28 in x 2.05 in) Compression Ratio: 9.5:1 Performance Horsepower Estimated: Approx. 53 hp @ 9,000 rpm Torque Estimated: Approx. 32 lb-ft @ 7,000 rpm Fuel System Carburetor Type: Four Mikuni VM22SS constant velocity carburetors Fuel Capacity: 16.0 L (4.2 US gal) Lubrication Oil Capacity With Filter Change: 2.7 L (2.9 US qt) Recommended Oil Viscosity: Yamalube 4 (or equivalent) 20W-40, 10W-40 or 10W-50 depending on temperature 🔧 Transmission Standard Transmission Type: 6-speed constant mesh Final Drive: Shaft Drive Features Clutch Type: Wet, multi-plate 📐 Dimensions Exterior Length: 2,140 mm (84.3 in) Width: 755 mm (29.7 in) Height: 1,175 mm (46.3 in) Wheelbase: 1,435 mm (56.5 in) Weights Dry Weight Estimated: 180 kg (397 lbs) Wet Weight Estimated: 198 kg (437 lbs) Tires Wheels Front Tire Size: 3.00H-18 Rear Tire Size: 120/90-17 Wheelbase Pattern: Spoked aluminum alloy 🛡️ Safety Features Ratings Safety Standards: N/A (Motorcycle safety ratings not common for this era) Active Features Braking System: Dual disc front, single disc rear 💡 Technology Features Infotainment Infotainment System: N/A (Classic motorcycle technology) Driver Assistance Driver Assistance Features: N/A (Classic motorcycle technology) Connectivity Connectivity Features: N/A (Classic motorcycle technology) 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000 km (1,800 miles) or 6 months, whichever comes first. Spark Plug Replacement Interval: Every 6,000 km (3,600 miles) Valve Clearance Check Interval: Every 12,000 km (7,200 miles) Fluid Specifications Brake Fluid Type: DOT 3 or DOT 4 (refer to manual for specific type) Fork Oil Type: Yamaha Suspension Oil (or equivalent SAE 10W fork oil) Final Drive Oil Type: Yamalube SAE 80W...