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New Honda 700cc parallel twin returns a claimed 3.7 litres per 100km.
Honda has announced a new 700cc motorcycle engine with powerful torque in the low to mid-range and class-leading fuel-consumption figures, along with a second-generation dual-clutch transmission, which will make its public debut in the Integra maxi-scooter - and two more as-yet-unnamed models - at November's Milan motorcycle show.
The engine is a long-stroke (73 x 80mm) liquid-cooled parallel twin, radically canted forward at 62 degrees to fit into the J-bone chassis architecture of a scooter, and Honda is claiming fuel consumption of less than four litres per 100km.
How? By resin-coating the pistons, using aluminum rockers (an industry first, says Honda), a 270-degree crankshaft and a uniaxial primary balancer.
One throttle body feeds both intake ports, with the geometry deliberately laid out to create interference between the two cylinders' intake processes, thus achieving precisely calculated changes to combustion timing.
The catalyser is placed directly under the exhaust ports so that the exhaust gases reach it while still hot and the dual-clutch transmission, first seen on the VFR1200F, is now lighter and more compact thanks to a simplified hydraulic circuit. - AFP
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