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MotoLibrary Score
57/100Balanced
Power
71 HP
Top Speed
220 km/h
Torque
77 Nm
Engine
747 ccm
Technical Overview
1976 Motobi Sei Technical Analysis & Specification Breakdown
At the heart of the 1976 Motobi Sei naked motorcycle, Motobi utilizes a 747 cc (45.6 cu in) air-cooled in-line six, four-stroke layout. In factory specification, peak output is rated at 71 HP (51.8 kW) at 8,500 rpm while maximum torque reaches 77 Nm (56.8 lb-ft) at 7,100 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 95 HP per liter and a 1,400 rpm working window between peak torque (7,100 rpm) and peak power (8,500 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
Rider ergonomics and chassis geometry center around a 1,450 mm (57.1 in) wheelbase engineered for balanced agility and highway composure.
Specific Output
95 HP/L
Power Band Window
7,100–8,500 rpm
Engine
Displacement747.0 ccm (45.58 cubic inches)
Engine TypeIn-line six, four-stroke
Engine DetailsIn-line six, four-stroke
Power71.0 HP (51.8 kW)) @ 8500 RPM
Torque77.0 Nm (7.9 kgf-m or 56.8 ft.lbs) @ 7100 RPM
Compression9.0:1
Bore x Stroke56.0 x 50.0 mm (2.2 x 2.0 inches)
Valves/Cylinder2
Fuel SystemCarburettor. 3X Dellorto 24mm
Fuel ControlOverhead Cams (OHC)
LubricationWet sump
CoolingAir
Max RPM9000
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet plate
Performance
Top Speed220.0 km/h (136.7 mph)
Exhaust6 into 6
Chassis
Frame Typedouble cradle steel
Front SuspensionMarcossochi
Rear Suspensiontwin shock
Wheelbase1450 mm (57.1 inches)
Wheels & Brakes
Front Tyre100/90-18
Rear Tyre120/90-18
Front BrakesDouble disc. Brembo
Front Brake Ø280 mm (11.0 inches)
Rear BrakesSingle disc. Brembo
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Overall Height1080 mm (42.5 inches)
Overall Length2120 mm (83.5 inches)
Overall Width760 mm (29.9 inches)
Other
StarterElectric & kick
Notes
Special version of the Bennelli 750 sei, sold new in Spain
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
