If the bike is a 1992 GSXR750 W, then it is watercooled The W signifies that.
The previous model was oil cooled, The model u have is a great bike. If it was me i would go and buy a genuine SUZUKI manual 4 this bike and not mess around using a Haynes manual, I know the SUZUKI manuals are expensive but the knowledge u gain is invaluable.
Busa Boy
March 2008