Triumph Tiger 100, Tiger 90, Speed Twin & Twenty-One Motorcycle – Comprehensive Workshop Manual & Repair Guide for T100, T100S, T100T, T100C, T100R, T90, 5TA, 3TA 1969

Triumph 350cc & 500cc Unit Construction Twins (1957-1974) - Comprehensive Workshop Manual & Repair Guide

This professional-grade workshop manual is the definitive resource for the Triumph T100 series and 350cc/500cc unit construction twins. Covering the evolution of these iconic British motorcycles up to the 1969 condition (and applicable to models through 1974), it provides essential technical data for mechanics, restorers, and vintage enthusiasts.

Whether you are performing a routine oil change or a full engine rebuild, this guide offers step-by-step instructions across all major assemblies, including the Tiger, Daytona, Speed Twin, and Twenty-One models.

Comprehensive Model Coverage

This manual includes specialized data for the following models:

• T100T Tiger 100 Daytona (1967-1974)
• T90 Tiger 90 (1963-1968)
• 5TA Speed Twin (1959-1966)
• 3TA Twenty-One (1957-1966)
• T100S Tiger 100 Sports (1962-1970)
• T100C Tiger 100 Trophy (1966-1972)
• T100R Tiger 100 Daytona (1967-1974)
• T100SS Tiger 100 Service Sports (1962-1966)

In-Depth Technical Content

The manual is divided into logical sections to assist with systematic maintenance and repair:

• General Data: Detailed specifications for bore and stroke (69x65.5 mm for 500cc, 58.25x65.5 mm for 350cc), compression ratios, and torque wrench settings.
• Engine & Transmission: Comprehensive procedures for stripping and reassembling the two-throw crankshaft, H-section connecting rods, and the four-speed gearbox.
• Lubrication System: Guide to the dry sump system, including oil pump plunger diameters (Feed: .3748", Scavenge: .4372") and oil pressure release valve maintenance.
• Fuel System: Tuning and synchronization for Amal Monobloc carburetters (Type 376/375) used in single and twin arrangements (T100T/R).
• Electrical & Ignition: Detailed timing instructions using stroboscopic lights or static methods, covering Lucas 12V systems and RM19 alternators.
• Chassis & Suspension: Service data for telescopic forks (damping oil: 190 c.c. per leg) and rear swinging fork pivot lubrication.

Expert Features for Restorers

• Engine & Frame Identification: Learn exactly where to find your numbers. Engine numbers are located on the left side below the cylinder flange, while frame numbers are stamped on the left side frame headlug.
• Model Specifics: Includes the 1969 supplement for high-performance 500cc machines starting from Engine No. H65573.
• Torque Specifications: Critical dry torque settings provided for flywheel bolts (33 lb/ft), connecting rod bolts (27 lb/ft), and cylinder head bolts (25 lb/ft).
• Service Tools: Illustrated guide to specialized Triumph service tools (Z-series) required for professional results.

Technical Specifications at a Glance

• Cubic Capacity: 490 c.c. (500 series) / 349 c.c. (350 series)
• Power Output: Up to 39 B.H.P. @ 7400 R.P.M. (Daytona models)
• Valve Timing: Clear instructions for aligning intermediate wheel dots for single and twin carburetter versions.
• Tire Pressures: Standard settings of 24 lb/sq. in. (front/rear) for optimal handling.

This manual ensures that the legacy of Triumph's unit construction twins remains on the road. From the "bathtub" styled 3TA to the high-performance T100R Daytona, every technical detail is accounted for to help you maintain peak performance and historical accuracy.