The Sery (from Serenella, one of Cesare's daughters) appeared in 1955-56 was top of the range. It was a single cylinder OHV four-stroke and 80° inclined valves, with a hemispherical combustion chamber. The cylinder was cast iron with integral barrel and it had a one-piece crankshaft.
The clutch was mounted directly on the left end of the crankshaft. A primary transmission with straight-toothed gears delivered power to the three-speed gearbox. Engine lubrication was splash system, without oil pump. The two versions (Turismo and Sport) had power output of 2 and 2.4 hp respectively. Top speed was 60 km/h at 5,500 rpm.
The tubular frame had an unusual structure, very close to a double raised cradle. The famous engineer Cesare Bossaglia worked on their design, before moving to Parilla.
Well over 50% of the mopeds built by Nassetti went to Belgium and Holland.
Engine: Single cylinder 4-stroke OHV
Bore & stroke: 38 x 44 mm
Engine Capacity: 49.8cc
Maximum power: 2.2 h.p. @ 6,500 rpm
Valve: Rods and rockers with two overhead valves inclined at 80° (OHV)
Carburettor: Weber MFM 14
Cooling system: Air cooled
Ignition type: Dynamo - 6 volts - 15 watt
Lubrication: Wet sump forced circulation with mechanical gear pump
Transmission: Gear primary, chain final
Clutch: Cable operated with multiple wet disk
Gearbox: 3-speed with handlebar control
Throttle: Cable operated
Frame type: Very close to a double raised cradle, tubular and pressed steel
Front Suspension: Telescopic fork and shock absorbers
Rear Suspension: Swingarm with hydraulic shock absorbers
Front Brake: Drum
Rear Brake: Drum
Front tyre: 2.00 x 18 in.
Rear tyre: 2.00 x 18 in.
Seat: Dual seat
Fuel tank capacity: c.10 litres
Fuel consumption: 1 litre per 75 km
Top speed: 60 km/h (37.28 mph)
Weight: ca. 50 Kg
Source: Hessink's NL