Wally,
I assume you be talking about the Phil Irving book. Mine is ISBN 0-85113-075-5, 5th ed'n 1973. It is a classic, but while the fundamentals of engineering don't change, its really 50's stuff & quite dated in many ways. eg discussion on springing & damping includes rubber springs & friction dampers.
There are other more modern books available now, eg "The Racing Motorcycle" & "Motorcycle Design & Technology".