Triumph Shift Assist System (if fitted)

System Description

The Triumph Shift Assist (TSA) system enables the rider to change gears without the use of the clutch. The system uses signals from the Shift Force Sensor Diagnosis (if fitted) (located on the gear change linkage) and the Gear Position Sensor Diagnosis to detect when a shift force is applied to the gear change pedal. Engine torque is then adjusted to facilitate a smooth, clutch free gear change.

System Operation

  • The Triumph shift assist system allows clutch free shifts for the majority of gear changes. However, it is recommended that the clutch is used for gear changes at slow riding speeds, or when riding in slow traffic.

  • The clutch must be used when selecting any gear from neutral, and also when selecting neutral from any other gear.

  • To ensure a smooth gear change, use a positive pedal force to select the next gear then release the pedal. Do not hold the pedal in its upper or lower positions.

  • Clutch free Up shifts are disabled by the system at engine speeds lower than 1,500 revolutions per minute (rpm) to prevent stalling.

  • At maximum engine speeds, clutch free up shifts are allowed by the system, but clutch free down shifts are disabled to prevent engine over speed.

  • The Triumph shift assist system is disabled if the motorcycle is traveling at its limited top speed. The system is automatically re-enabled when the motorcycle slows down from its limited top speed.

  • Engine torque is reduced when changing gear at high engine loads.

  • A throttle 'blip' is applied when changing gear at low engine loads.

  • Engine torque is returned to normal control when the gear change is complete.

TSA Operation Graph

Malfunction Action

  • If a Triumph shift assist malfunction occurs, the system will be inhibited and the Transmission Warning symbol will be illuminated on the instrument panel.

  • All Triumph shift assist related malfunctions must be rectified before the system can be re-enabled.

  • If the malfunction is related to the gear position sensor, the neutral position and gear position adaption must be reset and re-adapted before the system can enabled.

  • If the malfunction is related to the shift force sensor, the shift force sensor adaption must be reset and re-adapted before the system can enabled.

  • The Transmission Warning symbol will continue to be displayed until each adaption is completed successfully.