I've owned my LM since 1981. In that time, I've replaced 3 sets of clutch discs, one clutch hub, a rectifier board, and numerous seals...oh, and a whole bunch of batteries. I installed a B-10 cam in 1985 and had the tank, side covers, and frame painted w/ red imron paint. (I don't think you can use that paint anymore - was too toxic to the user, but the stuff has held up amazingly well in the intervening years.) Other than the usual oil/filter/valve adjustments, she has been a pretty reliable (for an Italian m/c) beast.
12 years ago, I got a second bike - a VFR 750 Honda. The Honda now gets most of the mileage, but the LeMans is still a great bike when I want to go for a short spirited "hop." I am still amazed, 27 years later, what a wonderful machine Sr. Tonti and Sr. deTomaso created all those years ago. You ride this thing hard and fast, you can NOT stop from getting a big smile on your face. I find myself laughing like a kid. Truly, che bella machina!