hey sorry for the late reply.. It cost me 40 pounds to fix as they were able to reset the tensioner and it so far has worked a treat no more noise . Worst case scenario is a new tensioner which i think is around £120 from yamaha.
@WasStoNed my appologies for late reply, i took it to what was called T7 Honda in ballymena but they are trading under a different name now... your better staying away from main dealers imo, the back street people will do a better job as they need trade to survive.. in theory anyhow!