| Manufacturer | Benelli |
|---|---|
| Production | 1972–1978 |
| Engine | 747 cc air-cooled inline-6 |
| Bore / Stroke | 56 × 50.6 mm (2.2 × 1.99 in) |
| Compression ratio | 9.8:1 |
| Top speed | 200 km/h (120 mph) |
| Power | 76 hp (57 kW) @ 9000 rpm[1] |
| Transmission | 5-speed, wet clutch |
| Suspension | Front: 38 mm Marzocchi telescopic forks Rear: Twin shock |
| Brakes | Front: Twin disc Rear: Drum |
| Tires | Front: 3.50 H 18 Rear: 4.25 H 18 |
| Weight | 235 kg (520 lb) (dry) 255 kg (560 lb) (wet) |
| Fuel capacity | 23 L (5.1 imp gal; 6.1 US gal) |
The Benelli 750 Sei is a motorcycle that was produced by Italian manufacturer Benelli from 1972 to 1978. It was the first production motorcycle with a 6-cylinder engine.[2] The engine was based on the four-cylinder Honda CB500, but with two extra cylinders.[3] 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. The "angular, bold design" was by Carrozzeria Ghia.[4]
Despite the extra cylinders, the Sei's width was kept to a minimum by siting the alternator (which, on the Honda, is at the left-hand end of the crankshaft) behind the cylinders. Cooling was improved by having air passages between the cylinders; the Sei had three Dell'Orto VHB 24 mm carburetors (the Honda CB 500 had four, for four cylinders).[3] After four years of production during which they sold 3,200 Sei models, Benelli developed the 750 Sei into a 900 cc motorcycle, with six-into-two exhausts, but built less than 2,000 of them.[3]
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