Meanwhile, in less than six months, Fabio Taglioni and his team had designed and built their own complete bike (The industry norm for concept to production is three years). While the 750 and 500 racers were very similar, the 500 had a much shorter 58 mm stroke with its 74 mm bore. It had 10.5:1 compression and initially produced at 11,000 rpm. (Same bore and stroke as the later 500 Pantah) All Ducati's 500 cc GP engines used desmodromic two valve heads with an 80 degree included valve angle. They used remote float bowl Dell'Orto 40 mm carburettors, and had a six speed gearbox with a dry, multiplate clutch. Ignition was electronic, provided by nearby Ducati Elettrotecnica, but was initially unreliable. Dual spark plugs were used, and the final ignition system used four coils, two on each side of the frame.