1970-1973 Triumph 650cc Twin Workshop Manual — T120R/TR6R/TR6C Models (213 P.)

Triumph 650cc Twin Workshop Manual 1970–1973

• Covers the 1970–1973 Triumph T120R Bonneville, TR6R Tiger, and TR6C Trophy, documenting both 4-speed and 5-speed transmission configurations
• Official Triumph Engineering Co. Ltd. publication, 1972 first edition
• Contains 213 pages of technical specifications, maintenance intervals, and exploded-view mechanical diagrams
• Accessible from your device as soon as the order is placed
• No DRM restrictions on the print function
• Full-text search finds any part number in seconds
• This 1972 first edition documents the specific mechanical configurations for the 650cc twin series, including the transition to 5-speed gearbox variants and early 70s US-market specifications

Technical Scope and Documentation

The 1970–1973 Triumph 650cc twin workshop manual serves as the primary technical reference for the maintenance and mechanical assembly of the T120R and TR6 series motorcycles. This publication documents the unit-construction engine architecture, detailing procedures for the crankcase, forged two-throw crankshaft, valve timing, and the lubrication system. Chapters delineate the operation of the concentric Amal carburetors, ignition timing for the contact breaker mechanism, and transmission adjustments including the multi-plate clutch and shock-absorber unit.

Additional coverage includes detailed frame and attachment data, telescopic fork maintenance, and wheel bearing lubrication schedules. Exploded diagrams provide visual context for the engine, gearbox, clutch assembly, and exhaust system routing. Understanding factory workshop documentation is structured to facilitate accurate diagnostic and service routines for air-cooled British motorcycles.

Specification Highlights

Technical data sections provide comprehensive torque values, clearances, and fluid capacities for the 650cc twin platform. The flywheel bolt torque is specified at 33 ft·lbs (4.6 kg·m) in the engine assembly data. Cylinder head bolt torque is documented at 18 ft·lbs (2.49 kg·m) for the outer bolts. The recommended engine oil capacity for the reservoir is 3 imperial gallons.

Valve clearance for the intake is listed at 0.002 inches in the engine specification table. Piston ring gap is specified at 0.010–0.014 inches within the assembly section. Final-stage ignition timing is set at 38° B.T.D.C. for the engine configuration. All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work.

An official 213-page Triumph OEM workshop manual covering the 1970–1973 T120R and TR6R models, documenting engine, transmission, electrical, and chassis specifications for the 650cc unit-construction twin-cylinder motorcycles.