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This naked streetfighter is powered by a 649cc inline-four, the Japanese companys third new engine in three years. Key design features of the powerplant include cylinders canted forward 30 degrees, a 16-valve DOHC cylinder head with direct cam actuation, PGM-FI fuel injection (working with 32mm throttle bodies), and connecting rods optimized in length to minimize side forces on the pistons, which have asymmetric skirts to further reduce friction. Whats more, breathing holes in the crankcase walls between the journals reduce pumping losses as rpm rises.
|2014 Honda CB650F Introduction Film|
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