Any old gits here with joints that crack? The top of my spine/base of the skull has started doing it, especially if I'm looking up or riding the gixxer, whereas riding the tourer is OK. Sometimes it feels like being hit with a cosh. Is it anything to worry about? JFGI doesn't work. Can I get ape-hangers for a 1990 GSXR1100? Would WD40 help?