Four-stroke Principle 

1966 Triumph unit 650 engine - exploded view 

 1963-65 Triumph unit 650 engine - exploded view

 Triumph 650 piston identifications  - rebore sizes

Triumph 650 unit oil system 

 Triumph 650 unit 4 speed gearbox part numbers

Triumph 650 unit 4 speed gearbox components 

Exploded view of a unit 650 4 speed gearbox 

Triumph unit 650-750 5 speed gearbox 

Exploded view of a 650-750 gearbox 

Exploded view of the clutch used on all Triumph unit motorcycles 

1963-65 Rear wheel specifications 

Data  including updated specifications 

West Coast USA specifications/bulletin 

ET Coil configuration - 1963 models only 

Taken from a original 1963 TR6SC 

Original 1967 TR6C coil position 

Differentials between 1963 -1966 + frames 

VDO Speedo mount 

Line reamer for Camshaft bushes