Triumph 650cc Twin Unit Construction Repair Manual (1963-1970)
Technician-level documentation for engines with unit construction, covering T120, TR6, and TR6R models. Includes diagrams and procedures for all major mechanical systems. Part number T989.
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Models Covered & Key Technical Specifications
Triumph 650cc Twin Unit Construction Repair Manual (1963-1970) Technician-level documentation for engines with unit construction, covering T120, TR6, and TR6R models. Includes diagrams and procedures for all major mechanical systems. Part number T989.
Triumph 650cc Twin Unit Construction Repair Manual (1963-1970) (T989) Engine & Unit Construction Manual - Diagnostics & Repair | Factory-Standards.
- Measured Unit Dimensions: 650 cc displacement establishes the engine's operational capacity.
- Baseline DPI Rating: 2.7953 in. bore diameter defines the standard cylinder bore measurement.
- Approved Securement Values: 8 mm thread size ensures proper fitment for critical components.
- Reference Clearance Data: 0.015 in. contact breaker gap ensures accurate ignition timing.
- Published Output Rating: 52 bhp at 6,500 rpm signifies the engine's maximum power output.
- Baseline Physical Specs: 384 lbs. dry weight determines the overall mass of the motorcycle.
Professional Workshop Service Manual & Technical Specifications
Triumph 650cc Twin Unit Construction Manual: Triumph 650cc T120, TR6, TR6R 1963-1970 Engine & Unit Construction Manual - Diagnostics & Repair Factory-Standards
Model-Designation: T120, TR6, TR6R // Machine-Range: 1963-1970 / Engine // Model-Designation: Official Triumph 650cc Twin Unit Construction Manual
Technical Specifications Table
| Component | System-Path | Logic |
|---|---|---|
| Engine Type | OHV | Unit Construction |
| Number of Cylinders | 2 | Inline Twin |
| Bore and Stroke | 71 x 82 mm | Standard Measurement |
| Displacement | 649 cc | Operational Volume |
| Compression Ratio | 9:1 | Compression Specification |
| BHP and RPM | 52 @ 6,500 | Performance Metric |
| Carburetor | Twin/Amal 930 | Fuel Delivery System |
Table of Contents Summary The documentation is partitioned into:
- Lubrication System (Section A)
- Engine (Section B)
- Transmission (Section C)
- Gearbox (Section D)
- Frame and Attachment Details (Section E)
- Wheels, Brakes and Tyres (Section F)
Carefully requiring thorough technical examination for Triumph 650cc Unit Construction Twins (T120, TR6, TR6R) from 1963-1970. This manual provides comprehensive procedures for engine disassembly, gearbox maintenance, and electrical system troubleshooting. It includes detailed specifications, diagnostic guides, and repair instructions necessary for accurate servicing. Repair information is provided for the engine's internal components, including pistons, valves, and timing systems. The document includes coverage of the gearbox, transmission, and clutch mechanisms. Brake system specifications are included for front and rear wheels, detailing adjustments and maintenance. This manual documents torque specifications for engine components to ensure proper seal compression uniformity.
This manual details the systematic removal and replacement of engine unit components, including the rocker boxes and associated parts. It covers the disassembly and reassembly of the carburettor systems, ensuring proper fuel mixture and performance. The front forks are explained in detail, covering their dismantling, inspection, and alignment procedures. Maintenance of the electrical system is covered extensively, including battery inspection, ignition systems, charging systems, and lighting components. Troubleshooting guides for common electrical issues are provided to assist technicians in diagnosing faults efficiently. The manual provides Accurate technical details for all major mechanical and electrical systems.
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