1977 MV Agusta 900 S Arturo Magni - Cento Valli

A 1977 MV Agusta 900 S Arturo Magni - Cento Valli sits at the top end of MV's road-going sporting lineup, representing what the factory's own trusted tuner could extract from the 900 platform once he set up shop independently. This is a hand-finished, four-cylinder sportbike built for riders who want the mechanical theater of a big transverse-four without pretending it's a modern machine. Expect heavy steering at low speed that disappears once you're moving, a gearbox that rewards deliberate shifts, and an exhaust note that genuinely stops conversations. It's not a bike you commute on casually — it's one you plan a ride around. The 1977 model carried over without significant mechanical changes from the prior year — buyers comparing it to a 1976 example should focus on mileage, service history, and condition rather than spec differences. Given Magni's hand-built nature, documentation and provenance matter more here than on a standard factory MV. Buyers tend to be established collectors or MV Agusta specialists already familiar with Italian fours, often stepping up from a standard 900 S and seeking the added exclusivity and mechanical pedigree of genuine Arturo Magni work. Collector interest remains strong, and clean, documented examples hold their value well.