It took my new tensioner to arrive for me to find the actual cause of the noise. That said it ended up being a very loose tensioner spring lock nut.. As soon as I felt it I knew that this was the issue..So a quick tight and tah dah...
Current
85 BX GT Mk1..
86 BX TRS Mk1
87 BX TRi
Gone
85 BX TRS mk1 auto... SOLD
90 BX TRi..parts....cubed