🏷️ Basic Information Identification Make: Triumph Model: 6T Thunderbird, TR6 Trophy, T120 Bonneville Model Variants: • 6T Thunderbird • TR6 Trophy • T120 Bonneville Model Years: 1963-1970 Codes Chassis Codes: 6T, TR6, T120 👋 Introduction Market Position Value Proposition: An indispensable resource for maintaining and repairing classic Triumph motorcycles, offering factory-level detail at an affordable price. Competitive Analysis Manual Superiority: Combines detailed service procedures with a comprehensive parts catalog, offering a complete solution for owners. Directly sourced and factory-level information. Key Features Comprehensive Coverage: Covers all major mechanical and electrical systems, offering end-to-end repair and maintenance guidance. User Friendliness: Written for both the novice and experienced mechanic, with clear, step-by-step instructions and supporting visuals. Cost Effectiveness: Provides significant cost savings compared to professional servicing or purchasing multiple specialized manuals. 📋 Manual Details Coverage Areas Manual Type: Workshop Service Repair Manual & Parts Catalog Language: English Format: PDF (Electronic) Compatibility: All Windows versions, All Mac versions Viewing Requirements: Adobe Acrobat Reader File Compression: ZIP (requires WinZip or WinRAR) File Size: 16 MB 📖 Manual Coverage Systems Covered Engine Systems: Engine assembly, lubrication system, oil pump system, timing system, carburettor system, air cleaner system, exhaust system Drivetrain: Transmission, gearbox system, clutch plates Chassis And Suspension: Frame and attachment, fuel tank & panels, wheels and tires, brake system, telescopic fork Electrical And Ignition: Electrical system, ignition system, lighting system Procedures Included Maintenance Procedures: Routine maintenance, fluid changes, lubrication, component inspections Repair Procedures: Engine overhaul, gearbox repair, brake system overhaul, suspension fork service, electrical component troubleshooting and repair Diagnostic Procedures: Troubleshooting guides for common issues, diagnostic steps for various systems Parts Information: Comprehensive parts catalog, component identification, exploded diagrams Troubleshooting: Dedicated sections for diagnosing and rectifying common and uncommon problems across all systems. Technical Depth Depth Of Coverage: Detailed step-by-step instructions, comprehensive repair procedures, full rebuild guidance Illustration Quality: Detailed illustrations, diagrams, and pictures Target Audience: DIY enthusiasts and professional mechanics 📊 Manual Specifications File Format File Type: PDF Searchability: Likely searchable text within PDF Print Quality Printability: Printable pages as needed Binding Type Delivery Method: Digital Download Paper Type Digital Format Benefit: Environmentally friendly, easily accessible, cost-effective Content Completeness Scope: Comprehensive, covering all aspects from basic maintenance to complete rebuilds and parts identification. ⚙️ Engine Specifications Primary Engine Engine Type: Parallel-Twin (2-cylinder) Engine Layout: Overhead Valve (OHV) Displacement: 649 cc Performance Bore X Stroke: Not specified in product info, but typically 71 mm x 82 mm for these models. Horsepower: Varies by model (e.g., T120 ~49 HP, TR6 ~50 HP), detailed in manual. Torque: Varies by model, detailed in manual. Fuel System Carburetion: Dual Amal carburetors (common specification for these models, detailed in manual). Fuel Type: Unleaded gasoline (appropriate octane for the era, details in manual). Engine Type Cylinder Configuration: Vertical Twin 🔧 Transmission Standard Transmission Type: Constant Mesh, 4-speed Optional Gearbox Housing: Unit construction Features Clutch Type: Wet, multi-plate Gear Ratios: Specific ratios detailed within the manual. Lubrication: Gearbox oil specification and capacity detailed in manual. 📐 Dimensions Exterior Wheelbase: Approx. 56 inches (1422 mm), varies slightly by model, detailed in manual. Weights Dry Weight: Approx. 400-450 lbs (180-205 kg), varies by model, detailed in manual. 🛡️ Safety Features Ratings Safety Features Era: Focus on mechanical integrity and rider control; no electronic safety aids common today. Active Features Braking System: Drum brakes (front and rear), hydraulic actuation. Manual covers service and adjustment. Passive Features Frame Construction: Steel duplex cradle frame. Manual covers frame inspection and repair. 💡 Technology Features Infotainment Era Appropriate Tech: Focus on mechanical and electrical systems; no modern infotainment. Driver Assistance Rider Assistance: Mechanical controls: throttle, clutch, brakes, gear shift. Manual covers their maintenance and adjustment. Connectivity Electrical System: Basic 12V electrical system, dynamo charging, ignition coil, battery. Manual provides detailed wiring diagrams and troubleshooting for these components. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 2,000-3,000 miles or annually, specific recommendations in the manual. Valve Clearance Check: Recommended at regular intervals, detailed procedure and clearances provided. Fluid Specifications Engine Oil: SAE 20W50 or SAE 30 mineral oil (specific API classifications and capacities in manual). Gearbox Oil: Specific gear oil recommendation and capacity in manual. Brake Fluid: DOT 3 or DOT 4 (if applicable to hydraulic systems, though many models of this era used oil in some controls). Known Issues Common Wear Items: Clutch plates, primary chain tension, valve guides, oil seals, electrical connections (covered extensively in manual). Performance Enhancements: Manual provides specifications for standard tuning and troubleshooting, allowing for optimization. 📚 Vehicle History Brand Heritage Marque Legacy: Triumph motorcycles are iconic British engineering marvels, renowned for performance, style, and a rich racing heritage. Model Evolution T120 Bonneville: Successor to the Bonneville T100, becoming a benchmark for performance and styling in the 1960s. Known for its twin-cylinder engine. Tr6 Trophy: Developed from the competition success of the T100/T110,...