The CDI Pickup for the electronic ignition system. Apparently this is a relatively common problem.
The on board clock wears the battery down if stood for extended periods (more than 2 - 3 weeks).
Overall I'm very impressed, it's not the lightest, fastest or best handling bike I've ridden, but has that unique combination of being good enough in each department to make it a great bike that you can live with.
It is certainly one of the most comfortable bikes, I've owned at just over 6'3". I find it easy to ride and handle, and don't get cramp like I do on many other sports tourers.
The seat height is not so good if you like your saddle a bit closer to the ground.
Just got a sprint 900 (1996) as my first bike. Bit heavy when manouvering, but fantastic fun. Generally above comments I agree with. But scary in strong side winds, but so was the Suzy GS500 I learnt on.
I bought my 1994 Sprint 7 years ago. I am still very happy with it, I have been to Switzerland on it, so I think that counts as a fair test ride. There is no other bike on the market at the moment that I am remotely tempted to have instead of the Sprint.
Your comments about seat hight are accurate. I am only 5'6", so the Sprint is really a bit tall for me, it is also quite top heavy, but I wanted one and I wasn't going to let common sense get in the way. This attitude has persisted throughout the time I have owned the bike.
The C.D.I. pickup went wrong on my Sprint as well. It was tricky to identify as the culprit as it was a temperamental fault.