Highlights
- Built by Rémy Monpezat in 2008 with a desmodromic valve system
- Innovative engine that became the foundation for all belt-driven Ducati engines
- Includes a spare disassembled engine for parts
- Only 30 hours of track use at historical events
The Appeal
This Ducati 671 Project Single hails from a pivotal moment in Ducati's engineering history, serving as the developmental prototype that would eventually lead to the Pantah engine and all subsequent belt-driven Ducati powerplants. This motorcycle is a faithful reproduction made by Rémy Monpezat in 2008, embodying the innovative work of Taglioni with the help of Gianluigi Mengoli, Piero Cavazzi and Franco Farne from their original project of 1976. For the Ducati enthusiast or collector of rare motorcycles, this represents an opportunity to own a physical piece of the brand's engineering evolution - the missing link between Ducati's early singles and their modern desmodromic engines.
As the photographs attest, this bike is in excellent condition, with just 30 hours of track time during various historical events. The motorcycle comes complete with period-correct components, including Ceriani Grand Prix replica forks, Koni rear shock absorbers, and a drum brake with four cams and magnesium flanges. Adding to its appeal is the inclusion of a spare disassembled engine for parts, making this a complete package for the serious collector or enthusiast looking to preserve a crucial chapter in Ducati's engineering history.
History and Paperwork
- Track bike: no registration documents
- Motorcycle engine number: M01100072
- Comes with a spare used engine (number M0110015) disassembled for parts
- Motorcycle has reportedly been ridden for 30 hours, generally on track during various historical events
- The Ducati 671 project was developed by Gianluigi Mengoli, Piero Cavazzi, Taglioni and Franco Farne from April to December 1976 in Taglioni
- This innovative engine was the study for the future Pantah engine and the father of all belt-driven Ducati engines
- Videos of the motorcycle at Coupes Moto Légende 2022 and Salon Moto Légende 2023 available
- Early 1970s project after the frozen 350GTL twin-cylinder study
- Taglioni, Farné, and Mengoli created an innovative single-cylinder
- Based on 860GT connecting rod and bore size of old 450 singles
- Unique prototype built by Rémy Monpezat in 2008
- Reportedly ready for track use
The Condition
- Maintained by its creator to an exemplary standard
- Modified frame from the old single-cylinder models with a rectangular-section swingarm
- Ceriani Grand Prix replica fork
- Damaged front fender (replacement fender included)
- Correct working condition
The Mechanics
- 406cc single-cylinder engine
- Features desmodromic head with oil feed to camshaft via rotating wick
- Manual transmission with six gears
- 86mm bore, 70mm stroke
- Desmodromic distribution system driven by a toothed belt in oil.
- 40mm intake valve, 38mm exhaust valve
- Distribution diagram: 60/90/97/70 (intake opening/intake closing/exhaust opening/exhaust closing)
- Mahle high compression piston (9:1 ratio)
- Polished connecting rod from an 860 GT
- Dell'Orto PHF 36 carburettor
- Drum brake with four cams and magnesium flanges (reproduction)
- Original rear brake
- Period Koni rear shock absorbers
- Swingarm pivot passes through engine cases
- Experimental engine allowing the installation of a chain-driven distribution system (boss provided behind the timing cover)
- Possible variation of the compression ratio (shim under the timing cover)
- Possible installation of a kick-start system (provisioned boss on the clutch cover)
- Design evolution from rounded to more angular forms
- Lubrication system feeds camshaft via rotating wick
- The bearings are spray-lubricated, the camshaft lobes are internally lubricated
- Stainless steel exhaust silencer on the left
- Swingarm pivot through engine cases concept retained, making the bike more compact
- Originally designed for the centrifugal advance and ignition plate of older single-cylinder motorcycles, a Motoplat electronic ignition was fitted as standard. Currently, a Guyonnet electronic ignition is fitted
- Pirelli was tasked with manufacturing a toothed belt that runs directly in oil. Currently, belt manufacturers have supplied a belt capable of operating under the most demanding conditions
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