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Italian Motorcycles

1953 MOTO RUMI 125 SUPER SPORT TT

From 1952, Rumi built the SuperSport model of its twin for road racing with two Dell'Orto carburettors mounted vertically above the engine and its own design of bottom-link front forks. The racing Rumis were developed by former FN and Saroléa designer Salmaggi, whose tuned version of the 125cc Super Sport motor produced 8 HP at 7,000 rpm and was good for 72 mph.

Specifications

Engine: Twin cylinder 2-stroke

Bore & stroke: 42 x 45 mm

Compression ratio: 10.5:1

Engine Capacity: 124.68cc

Maximum power: 9 h.p. @ 7.300 rpm

Electrical System: Nassetti magneto, CEV 105 headlight, CEV tail light

Carburettor: Dell'Orto UA 18

Cooling system: Air cooled

Transmission: Gear primary, chain final

Clutch: Cable operated with multiple wet disk

Gearbox: 4-Speed foot-change

Starter: Kick-starter

Throttle: Cable operated

Frame type: Lightweight steel tubing

Front suspension: Telescopic forks

Rear suspension: Plunger

Front Brake: Drum, full-width SLS Ø 140 mm

Rear Brake: Drum Ø 160 mm

Wheelbase: 1,250 mm

Front Tyre: 2.37 x 21 in.

Rear Tyre: 2.50 x 19 in.

Fuel tank capacity: 13 litres (18 litres on request)

Fuel consumption: 3.4 litres per 100 Km

Top speed: 115 km/h

Instrumentation: VDO speedometer 140 Km/h

Weight: 84 kg

Riding position: 1st series with cantilever saddle, second series with leather dual seat

List price at that time: 235.000 lire ex-works

Motor Kampioen magazine: Volume 4, no. 10, 7 February 1953, pp 188-189

Source: Hessink's NL