1970-1973 Triumph 650cc Twin Workshop Manual — T120R/TR6R/TR6C Models (213 P.)
Factory lubrication charts, carburetor adjustment, and timing specifications for Triumph 650 air-cooled twins. Covers T120R Bonneville, TR6R Tiger, TR6C Trophy engine rebuilds, gearbox overhaul, and electrical troubleshooting.
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Sample pages from the 1970-1973 Triumph 650cc Twin Workshop Manual — T120R/TR6R/TR6C Models (213 P.) manual
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Models Covered & Key Technical Specifications
Triumph T120R Bonneville, TR6R Tiger, TR6C Trophy, TR6RV Tiger, T120RV Bonneville — 1970–1973 Precision Engineering Vault | 650cc Twin Series Repository.
- Engineered Form Factor: Bore and stroke measures 71 × 82 mm (2.8 × 3.2 in) is calibrated to the cylinder dimensions Sequences.
- Measured Output Quality: Maximum torque reaches 36.5 ft·lbs at 6250 rpm represents the crankshaft peak performance Baseline.
- Documented Fastener Specs: The flywheel bolts require 33 ft·lbs (4.6 kg·m) is specified as the correct torque value Requirements.
- Prescribed Tolerance Values: Piston ring gap supports 0.010–0.014 inches (0.25–0.35 mm) compression clearance Threshold.
- Nominal Amperage Specs: Fuel tank capacity provides 3 imperial gallons (16 liters) maximum storage volume Mapping.
- Primary Unit Dimensions: Wheelbase is rated at 55 inches (140 cm) center-to-center measurement Configuration.
Professional Workshop Service Manual & Technical Specifications
Applied Technical Documentation Manual: Motorcycle Restoration Chronicle: Triumph 650 c.c. Unit Twins - T120R, TR6R/C und die 5-Gang-Modelle (1970-1973) Wiring-Compendium
Coverage-Scope: T120R Bonneville, TR6R Tiger 650, TR6C Trophy 650, TR6RV Tiger 650 (5 Speed), T120RV Bonneville (5 Speed) (1970-1973) // Diagnostic-Area: Engine and transmission systems configuration logic // Asset-ID: Comprehensive factory technical reference.
| Document Section | Content Focus | Reference Material |
|---|---|---|
| Lubrication System | Oil pump details, pressure release valve assembly, engine oil circuit routing, crankshaft and camshaft bearing lubrication paths | Complete specifications provided |
| Engine Assembly | Cylinder head, valves, camshaft timing gear arrangement, piston and connecting rod specifications, crankshaft geometry | Technical drawings included |
| Transmission Components | Clutch multiplate design, shock absorber unit construction, primary and rear chain systems, gear cluster assembly | Service specifications documented |
OEM specifications cover the engine lubrication system detailing pressure relief valve assembly and crankshaft bearing journals, further addressing the transmission clutch configuration, providing shock absorber rubber pad renewal procedures, and documenting the primary chain tension adjustment mechanism, while also presenting gearbox component inspection criteria and rear chain elongation measurement standards.
Logically demanding documentation addresses the fuel system with carburetter adjustment protocols and air control cable routing specifications. System operation descriptions cover the telescopic fork hydraulic damping action, including damper valve operation and oil seal retention within the stanchion assembly. The documentation addresses electrical system components including the alternator output characteristics, rectifier circuit configuration, ignition coil primary winding resistance values, and contact breaker point gap calibration requirements. Assembly instructions are detailed for brake shoe installation within the drum assembly, swing arm bush replacement methodology, and wheel bearing removal using service tools. Hydraulic schematics are included for the rear suspension unit spring preload adjustment mechanism and telescopic fork damper tube construction details.
The manual documents torque specifications for the cylinder head bolts to ensure proper seal compression uniformity.
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