| MODEL | MV AGUSTA 850 MAGNI 1978 |
| Year | 1978 |
| Engine Type | Four stroke, transverse four cylinders, DOHC, 2 valves per cylinder |
| Displacement / Capacity | 837 cc / 51.0 cu in |
| Bore X Stroke | 89 x 56 mm |
| Compression Ratio | 10.3:1 |
| Cooling System | Air cooled |
| Max Power | 61 kW / 81.8 hp @ 9000 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | 4x 27 mm Dell'Orto carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 speed |
| Clutch | Multiple disc in oil bath |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Tubular steel, welded, double cradle |
| Front Suspension | 38 mm Forcelle Italia telescopic forks, preload and rebound damping adjustable |
| Rear Suspension | Dual Koni shocks, preload adjustable |
| Front Brakes | 2x 280 mm discs |
| Rear Brakes | Single 280 mm disc |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 200 kg / 440 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 110/80-18 |
| Rear Tyre | 150/70-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 19 Litres / 5.0 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 850 Magni was a 750 MV Agusta four rebuilt by the Magni workshop, bored to about 840 cc and fitted with chain drive, a new engine cradle and a new exhaust. Arturo Magni had been MV's racing chief and began building MV-based specials after the factory left racing. It sits between the factory 750S and the later 861.
