noise zx2r

ive recently started to hear a clunky noise coming from engine its kinda a ticky clunky if that makes sense but it only seams to happen doing 70 km at 7000 rpm? any ideas hints would be of great help.
vtw its a 00 zx2r with 14,000 km
vtw its a 00 zx2r with 14,000 km