The Benelli 650 Tornado S2 is a testament to the company’s rich history of innovation and racing heritage. Born from a desire to create a more reliable, high-quality alternative to the iconic BSA and Triumph twins, this parallel twin-cylinder engine boasts an undersquare bore and stroke configuration that promises exceptional performance.
The four-stroke OHV design with two valves per cylinder is a masterclass in balance and refinement, delivering a smooth, effortless riding experience that belies its 642.8cc displacement. The result is a bike that exudes the classic charm of its era while offering the kind of reliability and build quality that was previously reserved for more established manufacturers.
As you fire up the engine and feel its characterful growl come to life, it’s clear that this Benelli has been built with one thing in mind: to deliver an unforgettable riding experience. With its beautifully balanced chassis, precise handling, and infectious enthusiasm, the 650 Tornado S2 is a true classic that remains as thrilling today as it did when first unveiled in 1967 – a bike that truly justifies its place among the most revered two-wheeled icons of all time.
Key Specifications
Engine Type
Parallel twin cylinders, four stroke, OHV, 2 valves per cylinder
Engine Capacity
642.8 cc / 39.2 cu in
Max Power
38.8 kw / 52 hp
Fuel Tank Capacity
17 L / 4.5 US gal
*n/a – information not provided by manufacturer
All Specifications
Make & Model
Model
Benelli650Tornado S2
Year
1973 – 74
Engine
Engine Type
Parallel twin cylinders, four stroke, OHV, 2 valves per cylinder
Displacement
642.8 cc / 39.2 cu in
Bore x Stroke
84 x 58 mm
Compression Ratio
8.0:1
Max Horsepower
38.8 kw / 52 hp
Engine Management System
2 x Dell’Orto VHB 29 carbs
Cooling System
Air cooled
Performance
Top Speed
n/a
*n/a – information not provided by manufacturer
Transmission
Clutch
Multiplate, wet
Gearbox
5 Speed
Final Drive
Chain
Electrical & Electronics System
Starter
Electric and kick start
Chassis & Suspension
Front Suspension
Marzocchi tele-hydraulic forks
Rear Suspension
Swinging arm, adjustable shocks
Wheels & Brakes
Front Tire Size
3.50 -18
Rear Tire Size
4.00 -18
Front Brakes
Drum, 4 leading shoe
Rear Brakes
Drum
Dimension & Weights
Fuel Tank Capacity
17 L / 4.5 US gal
Dry Weight
210 kg / 463 lbs
Features
Parallel twin cylinders, four stroke, OHV, 2 valves per cylinder
75cc two-stroke engine
98cc two-stroke engine with increased power
First Benelli motorcycle in 1923 powered a 98cc engine
175cc sohc four-stroke engine for racing
Dohc design in 1931 for the first time
Four-cylinder supercharged 250 in 1939
Lightweight transport saw Benelli road bikes offered in capacities of 98, 125, 350 and 500cc
Post-war expansion saw 550 employees and 300 motorcycles produced per day
Modernisation of four-stroke singles for exports to the US
Four-stroke vertical twin with improved reliability and build quality
Undersquare bore and stroke of 84 x 58 mm in the 650 twin
Displacement of 642.8cc in the 650 twin engine
Single 30mm DellOrto carburettor with 30mm inlet tracts
Power output of 50hp at 7000rpm claimed by the factory
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*We strive to provide the most comprehensive and accurate specifications possible. However, certain details may not be available if the manufacturer did not disclose them or if the information is no longer publicly accessible. If you find any discrepancy with any data on this site, please feel free to let us know at contact@throttlecraze.com
