http://suzukisavage.com/cgi-bin/YaBB.pl?num=1240751610

Windex, windex, windex, or blue cheapy equivalent, with ammonia. grips slip right off! slicker than sn*t.  

separate the rubber from the plastic ring, pry up with a small screwdriver and spray it in.

Hammer and a razor blade. I knock the chromed plastic ends off, throw them away if I can find them, and cut through the old grip with a single edge razor blade. Sand the ridges off your stock plastic throttle sleeve (the long white thing under the grip), makes sliding the new grip on 1000x more easy. Your replacement grip is unlikely to have the grooves the ridges go in anyway.

Hair spray makes a decent grip glue... but contact cement (slide the grip on while the glue is wet) works better. Spray it IN the grip, not on the bar.