[3][4] De Tomaso intended it to become Italy's premier sporting motorcycle and wanted it badged as a Moto Guzzi.

[6][7] The cylinder head fins of the Sei were squared off to provide a cosmetic individuality, but otherwise the engine is in most respects obviously derived from the Honda.

[8] It produced 76 bhp (57 kW) at 9,000 rpm, had a top speed of around 127 mph (204 km/h) and was one of the smoothest European tourers.

[7] The vehicle appeared to reviewers as heavy and cumbersome but handled surprisingly well, and had a unique signature exhaust note from its six mufflers.

In 1979, by which time Benellli had sold 3,200 vehicles, Benelli developed the 750 Sei into a 900 cc motorcycle by increasing bore and stroke,[6] with six-into-two exhausts and a small bikini fairing taken from the Moto Guzzi Le Mans.