The ER6n was released in Europe first and then followed by the ER6f (aka American Ninja 650r). Since that America is infatuated with either cruisers or sportbikes, Kawasaki decided to release the Er6f/Ninja 650r first and then the naked version this year.
Parallel twin's power delivery is similar to V-twin except that the exhaust would sound a little more growly than thumpy.
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Cogito Ergo Vroom - I think therefore I ride
 
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