🏷️ Basic Information Identification Make: Triumph Model: 650 Twin Series Covered Models: • 6T Thunderbird • TR6 Trophy • T120 Bonneville Codes Engine Number Start: DU13375 👋 Introduction Market Position Target Audience: Owners and restorers of Triumph 650 twin motorcycles (6T Thunderbird, TR6 Trophy, T120 Bonneville) from engine number DU13375 onwards, mechanics, and parts suppliers. Competitive Analysis Value Proposition: Provides essential visual and numerical references for identifying correct replacement parts, crucial for maintaining the originality and functionality of classic Triumph motorcycles. Key Features Illustrated Parts: Fully illustrated with exploded views for clear identification of components and their relationships. Disassembly Assembly Aid: Designed to assist in the dismantling and reassembly process by clearly showing how parts fit together. Part Number Reference: Includes specific part numbers for ordering, crucial for sourcing the correct replacements. 📋 Manual Details Coverage Areas Primary Focus: Parts Identification and Listing Page Count Estimated Pages: Varies by edition, typically 100-200 pages for a comprehensive parts manual. Manual Type Type: Parts Manual / Parts Catalog Language Language: English Format Format: Printed (likely, based on description) 📖 Manual Coverage Systems Covered Engine: Crankcases, cylinder head, cylinders, pistons, crankshaft, con-rods, valve gear, timing. Fuel System: Carburetors (e.g., Amal Monobloc), intake manifolds, fuel tanks, fuel lines, petcocks. Transmission: Gearbox components (mainshaft, layshaft, gears, selector mechanism), clutch assembly. Chassis And Frame: Frame members, headstock, swinging arm, suspension linkages. Front Suspension: Front forks (e.g., Girling, Marzocchi), stanchions, springs, damping mechanisms. Rear Suspension: Shock absorbers, mounting points. Brakes: Front and rear brake components (drums, shoes, levers, cables, linkages). Electrical System: Ignition system components (magneto, coils, points, plugs), lighting components (headlight, taillight, indicators), wiring harness diagrams (often in separate manuals, but key components may be listed). Wheels And Tires: Rims, spokes, hubs, bearings, tire sizes. Bodywork And Fittings: Fuel tank, seat, fenders, side panels, handlebars, controls, exhaust system components. Procedures Included Assembly Guidance: Exploded views aiding in part identification during assembly and disassembly. Part Identification: Comprehensive listing of individual parts with corresponding part numbers. Reassembly Aid: Visual reference for correct part sequencing and orientation. Technical Depth Depth: Parts identification and cataloging, facilitating procurement of correct replacement components. 📊 Manual Specifications File Format File Format: N/A (Assuming printed product) Print Quality Print Quality: Assumed good quality for clear illustration of parts and diagrams. Binding Type Binding Type: Likely comb-bound, stapled, or saddle-stitched for ease of use in a workshop environment. Paper Type Paper Type: Durable paper stock suitable for workshop use, potentially coated for longevity. ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, parallel-twin (vertical twin) Displacement: 649 cc (39.6 cu in) Bore X Stroke: 71 mm x 82 mm (2.80 in x 3.23 in) Compression Ratio: Typically 7.3:1 to 8.5:1 depending on model and tuning Valve Train: Overhead valves (OHV), pushrod operated. Performance Horsepower Est: 40-50 bhp (approximate, varies by model and tuning) Torque Est: 40-50 lb-ft (approximate, varies by model and tuning) Fuel System Carburetors: Typically single or twin Amal Monobloc carburetors (e.g., 30mm or 32mm). Specific sizes vary by model and year. Fuel Type: Leaded or unleaded gasoline (depending on era of manufacture and engine modifications). Ignition Ignition System: Magneto ignition (common in earlier models) or coil ignition with breaker points. 🔧 Transmission Standard Type: 4-speed constant mesh, foot-shift operated (often with right-foot shift on earlier models, transitioning to left-foot shift). Features Clutch: Wet multi-plate clutch, cable operated. Drive Type: Chain drive (rear). 📐 Dimensions Exterior Wheelbase Est: Approximately 56-57 inches (1422-1448 mm), varies slightly by model. Weights Dry Weight Est: Around 380-420 lbs (172-190 kg), depending on model and equipment. 🛡️ Safety Features Ratings Safety Ratings: N/A (As this is a pre-modern safety certification era motorcycle) Active Features Braking System: Drum brakes (front and rear). Single leading shoe (SLS) or double leading shoe (DLS) depending on model and year. Passive Features Lighting: Headlight, taillight, brake light, (optional) turn signals. 💡 Technology Features Infotainment Infotainment Features: N/A - This era of motorcycle predates modern infotainment systems. Technology focus is on mechanical and electrical systems. Driver Assistance Assistance Features: N/A Connectivity Connectivity Features: N/A 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 2,000-3,000 miles (3,200-4,800 km) or annually, whichever comes first. Consult the manual for specific recommendations. Valve Clearance Check: Every 3,000-6,000 miles (4,800-9,600 km), depending on engine condition and usage. Crucial for performance and longevity. Chain Adjustment: Regularly, checking for slack and proper tension before rides. Typically 1/2 to 3/4 inch of play. Fluid Specifications Engine Oil Type: SAE 20W/50 motorcycle-specific oil is commonly recommended for these air-cooled engines. Always verify with specific workshop manual recommendations. Engine Oil Capacity: Approximately 4-5 pints (2-2.5 liters), including oil in the gearbox and primary chaincase. Gearbox Oil Type: EP (Extreme Pressure) 90-weight gear oil is typically used. Often shared with the engine oil sump on these models. Fork Oil Type: Specific fork oil viscosity (e.g., SAE...