Triumph Triumph Speed Twin, Thunderbird, Tiger 100, Tiger 110, Trophy TR5, Trophy TR6, and Bonneville T120 1956–1962 Workshop Manual (PN 99–0837)

• Covers 1956–1962 Triumph Speed Twin, Thunderbird, Tiger 100, Tiger 110, Trophy TR5, Trophy TR6, and Bonneville T120 motorcycles
• Official Triumph Engineering publication No. 17 (reprinted Nov. 1973, PN 99–0837)
• Contains 36 detailed exploded-view diagrams and indexed parts lists for major engine and transmission assemblies
• 194-page PDF document providing essential factory tolerances to streamline your daily repair and maintenance workflow
• Details service procedures for S.U. carburetors, Slickshift gearchange mechanisms, telescopic forks, Girling suspension units, Lucas alternators, contact breaker points, and quickly detachable (Q.D.) rear wheels
• Explains the overhaul of swinging forks, Lucas magnetos, multi-plate clutches, internal expanding brakes, Renold chains, and Smith's speedometers

Engine and Transmission Technical Overview

This documentation details the mechanical systems of vintage Triumph twin-cylinder motorcycles. It provides exact technical descriptions for the dry-sump lubrication system, covering pump operation and pressure relief valve maintenance. Whether you are tearing down the crankcase or assembling the crankshaft and connecting rod groups, these factory references streamline your daily workflow in the shop. Engine data outlines valve timing diagrams, ignition setup for both magneto and coil systems, and vital Amal Monobloc carburetor specifications. Before beginning any teardown, ensure your workspace is properly ventilated and all ignition sources are secured when handling vintage fuel systems. Gearbox references clarify the positive-stop selection mechanism and clutch shock absorber adjustments.

Step-by-step instructions cover complex jobs that would otherwise require an expensive specialist. You can confidently tackle decarbonizing the cylinder head without removing the engine block, balancing the one-piece crankshaft, completely rebuilding the hydraulically controlled telescopic forks, or overhauling the four-speed transmission. Troubleshooting electrical faults or fuel delivery issues is simplified by following the systematic diagnostic sequences. Furthermore, the manual features essential visual aids, including wiring diagrams, engine lubrication diagrams, gearbox component parts views, telescopic fork exploded views, clutch and shock absorber exploded views, and S.U. carburetor component parts views.

Maintenance and Specification Data

Rely on comprehensive maintenance tables to verify service intervals for oil changes, chain tension, and steering head bearing lubrication. The data sheets provide critical identification details for proprietary equipment like Amal carburetors, Lucas electrical systems, and Dunlop tires. Key tolerances are clearly listed, noting the T110 inlet valve clearance at 0.002 inches and a primary system engine oil capacity of 5 pints. For optimal output, Bonneville T120 ignition timing is specified at 39° before T.D.C. The primary advantage of utilizing this documentation is the ability to cross-reference precise OEM clearances directly at the bench. For example, distinguishing between ramp-cam and high-lift camshaft tappet clearances prevents costly machining errors and ensures your valve train performs strictly to original manufacturer standards.