Miniature Marvel: Inside the Ducati 125cc GP Four

Giancarlo Morbidelli locates a Ducati 125cc GP four prototype’s missing pieces and painstakingly restores it to original condition.

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by Phil Aynsley
First sketched out on paper by Fabio Taglioni in the 1950s, then half-heartedly developed to a semi-prototype stage in 1958, the project was revived in 1965.

Engine: 125cc air-cooled DOHC 4 valves per cylinder inline four, 34.5mm x 34mm bore and stroke, 12:1 compression ratio, 23hp @ 15,000rpm
Top speed: 125mph
Carburetion:Four 12mm Dell’Orto (originally; 16mm now fitted), twin floats/one per pair of carburetors
Transmission: 8-speed, chain final drive
Electrics:6v battery, coil and breaker point ignition x 4

  • Published on Dec 11, 2018
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