Any chance that the bulb in the switch is burned out? Does anyone actually feel any difference between sport and regular mode on those 15 plus year old shocks? I was an 81 for a few months and I couldn't tell the difference.
My 81 had these adjustable shocks and they worked, but the difference was not that big and at the time the back ones where shot, i switched to bilstein not adjustable and still better imo.
On my HDJ81 I find the difference is very noticeable. From soft and bouncy to stiff and rigid. The other day I was going through my home stretch thinking 'heck the road is worse than usual' when I noticed the shocks were in sport mode (which gives great control for high speed driving on smooth surfaces)...
Anyway, I must say this is an option I like very much and that I use quite more than occasionally