I've got a '97 916 that seems to have a familiar problem but I can't seem to track down the specific culprit or maybe its just the same problem reoccurring frequently. When I bought the bike about 3 years ago and after riding it most of the summer, the battery unexpectantly died on me one day. I had been riding most of the morning (2-3 hours) and had stopped at a roadside deli to get a bite to eat. When we decided to continue our ride low and behold my 916 barely had enough juice to turn over, not even enough to start. Lukily after checking all the connections we got it to bump start and I limped it home. I know Duc's are notorious for their voltage regulators, maybe I was naive to think that I had somehow got the only good one in the batch. I took it to the local dealer and they at first thought it was the alternator but turns out they said it was the regulator. They went ahead and gave me a new alternator, but replaced the regulator with a new OEM one. Since then I've been stranded about 3 times but everytime I get the charging system checked it comes back fine. I leave it on a trickle charger whenever I'm not riding it, doesn't matter for how long, up to 3-4 weeks, and it still has died on me. If I wasn't so crazy about riding it, I would be afraid to take it out on a long ride by myself (there's just something about that desmo). It seems to only do it when the engine warms up. I've actually limped it into work one morning when it was just beginning to start to cut out, which it begins to do when all this starts to happen. I had a trailer lined up and everything to haul it back home, and when I sat down on it, it started right up and everything was fine once again. Like I said, it starts to loose power rapidly, idling very rough, will not rev past probably 2K, and if it starts to do this you better find a safe place to pull over because it will only last about 1/2 mile more. Once it dies, it's dead, funny thing is if I put a new battery on it then (while its hot), it starts right up and I can get it home. I assume its running only on the battery's charge. Correct me if I'm wrong but I thought that it would run on it's own once started (say with a dead battery). Is there something that I'm missing because I leave it on trickle, had the charging system checked several times (albeit maybe when it was cold at the shop), and have gone through about 4 batteries? Is there a better alternator/regulator combo out there that may fix this problem or is it there something else? Please help, I want to ride my Duc with confidence.