As a large part of cornering on a motorcycle involves leaning over, a four-wheeled motorcycle would seem impossible. But Yamaha seems to have gotten a handle on this idea with the Tesseract concept, which uses a double scythe suspension that lets the twin motorcycle frames lean to either side.

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Yamaha designed the Tesseract with a hybrid power system, just in case you think a conventional motorcycle engine uses too much gas. The Tesseract would combine a V-twin gas engine with an electric motor.

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For this sport-tourer concept, Honda uses a boxer-style six-cylinder engine, with a massive 1,800cc displacement.

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Although the cowling looks sharp and mean, the DN-01 is a rather moderate concept bike. Its seating position is almost upright, and it uses a reasonable 680cc V-twin engine.

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Yamaha's Luxair concept enters Akira territory with tons of tech. Its hybrid powertrain uses an electric motor for extra boost and as a reverse gear. Yamaha equipped it with the Natural Sound Motorcycle Audio System, which can send audio to the rider's helmet via Bluetooth.

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As the name implies, Suzuki designed the Biplane to capture the feeling of flying an airplane. The concept is sure to get plenty of lift from its 1,000cc V-4. Just hope you don't actually leave the ground.

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Although Yamaha designed the MT-OS to look like a stunt bike, with a rear wheel made just for popping wheelies, the concept has some real tech. It uses an LED headlight and a keyless starting system.

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Tech-wise, there isn't much to speak of with the Sakura. It uses standard running gear, such as a 1,000cc air-cooled V-twin. But it demonstrates a motorcycle design that looks like a work of art.

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Yamaha explores a practical fuel-cell design for a scooter with the FC-Dii. Its fuel cell uses methanol to generate electricity, which can then be stored in its lithium-ion battery. That battery can also be taken out and recharged.

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The FC-Dii uses a methanol-water mix for fuel and a 1 kilowatt fuel cell. Its tank holds 3.6 liters of its methanol-water fuel, but Yamaha hasn't released any performance figures yet.

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The FC-Aqel is another fuel-cell concept scooter from Yamaha, but this one uses compressed, gaseous hydrogen, with two tanks mounted underneath the back of the seat.

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The name of this concept stands for cute, clean, and compact. It uses an electric drive and is designed as a daily commuter.

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Bobby is another electric scooter design, with a foldable frame making storage more convenient. You could ride this up to your office and store it in a corner for the day.

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