Welcome Stephen.
From the owners manual (you can also search the list at
triumphnet.com)
- Rotate the rear wheel to find the position where the chain is
tightest, and measure the vertical movement of the chain midway
between the spockets.
- The vertical movement of the chain must be 1.4 - 1.6 inches (35-40mm)
- Loosen the clamp bolt which secures the rear hub/eccentric adjuster
to the swing arm
- Using the 'C' spanner supplied in the motorcycle tool kit, turn the
rear hub/eccentric adjuster (clockwise to loosen, anti-clockwise to
tighten) until the drive chain is correctly adjusted.
- Tighten the rear hub/eccentric adjuster clamp bolt to 55 Nm
- Rotate the rear wheel and repeat the chain adjustment check