Just listened to the Manx Radio clip and all the bikes involved apparently were Kawasaki's, the ZXR750 was developed late into the 90's so could be an age thing with the 3 WSB homologation bikes / parts they made - the ZXR750K1 1992/3 ZXR750M1 1994/5 and the last ZX7N1 which was 1996/7, these bikes(I own a K1) have some pretty trick parts as standard and are nothing like the road going versions.