🏷️ Basic Information Identification Make: Triumph Model Range: 650cc Twins Specific Models Covered: T120, TR6, 6T Year Range: 1963-1970 Codes Engine Type Designation: Overhead Valve (OHV) Parallel-Twin 👋 Introduction Market Position Target Audience: Enthusiasts and professional mechanics working on vintage Triumph 650cc motorcycles. Competitive Analysis Value Proposition: Provides access to the same detailed information used by professional technicians, enabling DIY repairs and significant cost savings. Key Features Completeness: Highly detailed, step-by-step instructions and repair information covering a wide range of maintenance and repair tasks. Usability: Downloadable PDF format for easy access and printing of specific sections. 📋 Manual Details Coverage Areas General Information: Included Periodic Maintenance: Included Tune Up Procedures: Included Engine: Included Fuel System: Included Lubrication System: Included Electrical System: Included Chassis: Included Servicing Information: Included Page Count Total Pages: 239 Manual Type Type: Service Repair Manual Language Primary Language: English Format Delivery Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed coverage of cylinder head, valves, pistons, connecting rods, crankshaft, bearings, lubrication system (oil pump, filter, passages), and timing (camshaft, timing chain/gears). Fuel And Carburetion: Comprehensive information on Amal carburetors (monobloc and concentric types), fuel tanks, petcocks, fuel lines, and fuel pump (if applicable). Ignition System: Details on magnetos, distributors, coils, spark plugs, wiring, and timing adjustments. Transmission And Clutch: Covers the 4-speed gearbox, clutch operation, assembly, adjustment, and common wear parts. Electrical System: Wiring diagrams, lighting systems, charging system (alternator/dynamo), battery, horn, and switchgear. Chassis And Suspension: Front forks (leading link or telescopic), rear suspension (swingarm, shocks), wheel bearings, steering head bearings, and frame components. Braking System: Information on drum brakes (front and rear), brake shoes, brake cables, and linkage adjustments. Wheels And Tires: Wheel spoke inspection, spoke tensioning, tire pressure recommendations, and wheel bearing maintenance. Procedures Included Routine Maintenance: Oil changes, lubrication points, chain adjustment, brake adjustment, tire pressure checks. Tune Ups: Carburetor synchronization and adjustment, ignition timing, spark plug gap setting, valve clearance checks. Troubleshooting: Diagnostic procedures for common running issues, electrical faults, and mechanical problems. Component Overhaul: Detailed disassembly, cleaning, inspection, and reassembly procedures for engine, gearbox, carburetors, and other major components. Rebuilds: Guidance on complete engine and gearbox rebuilds, including bearing replacement, seal replacement, and component refurbishment. Technical Depth Diagnostic Capabilities: Advanced diagnostic techniques for identifying subtle issues with engine performance, electrical circuits, and mechanical wear. Repair Scope: Comprehensive repairs covering everything from routine adjustments to full engine and gearbox rebuilds. Specification Data: Includes critical torque values, clearances, timing settings, and fluid capacities required for accurate servicing. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely searchable text content within the PDF. Print Quality Printable: Yes Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Compatibility Operating Systems: Win/Mac Compatible Requirements Software Requirement: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Configuration: 649cc (39.6 cu in) air-cooled, OHV parallel-twin Performance Horsepower Range: Approximately 45-50 bhp depending on model and tuning (e.g., T120R Bonneville typically higher output). Torque Range: Estimated 38-40 lb-ft at peak RPM. Fuel System Carburetor Types: Typically Amal Monobloc or Amal Concentric carburetors (single or twin setups). Lubrication Oil System: Wet-sump lubrication system with oil pump and filter. 🔧 Transmission Standard Gearbox Type: 4-speed constant-mesh manual gearbox. Features Clutch Type: Multi-plate dry or wet clutch (depending on specific model evolution). 📐 Dimensions Exterior Wheelbase: Varies by model, typically around 56-58 inches. Weights Dry Weight: Approximately 370-420 lbs (168-190 kg) depending on model. 🛡️ Safety Features Active Features Braking Performance: Drum brakes front and rear, requiring careful modulation. Manual provides guidance on adjustment and maintenance. Passive Features Frame Construction: Duplex cradle frame, designed for rigidity and stability. 💡 Technology Features Infotainment System Description: N/A - This era of motorcycles predates modern infotainment systems. Focus is on mechanical and electrical fundamentals. Driver Assistance System Description: N/A - No electronic driver assistance systems were present on these models. Connectivity System Description: N/A - No connectivity features available. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 1,000-2,000 miles or as specified in manual; crucial for engine longevity. Valve Adjustment Interval: Recommended every 3,000-5,000 miles or as per manual, critical for performance and engine health. Fluid Specifications Engine Oil Type: Viscosity typically 20W/50 or 20W/40 motorcycle-specific oil. Manual will specify exact grades and API classifications. Gearbox Oil Type: Specific gear oil grade, manual will detail the type and quantity. Known Issues Common Wear Parts: Valve guides, piston rings, clutch plates, gearbox bushings, wheel bearings, and steering head bearings are common wear items requiring regular inspection and potential replacement. Electrical Gremlins: Lucas electrical components can be prone to issues; the manual's wiring diagrams are invaluable for troubleshooting. Carburetor Tuning: Amal carburetors can require frequent adjustment due to fuel volatility and wear; the manual covers tuning procedures. 📚 Vehicle History Brand Heritage Manufacturer: Triumph Engineering Co. Ltd., a renowned British...