Honda’s faired four-cylinder middleweight gains 3kW peak power and raucous induction roar, plus a Showa Dual Bending Valve front fork and revised Nissin brake calipers. Redrawn bodywork highlights the engine and aggressively pumps up the Super Sport style.
For 2017, the CBR650F’s engine has an extra 3kW up top, with a 67kW @ 11,000rpm peak power output. The increase – which is noticeable from 5,000rpm – is due to new intake and exhaust flow management: shorter air intake funnels feed four 32mm throttle bores from a down-flow airbox (which itself draws through larger intake ducts) and in turn the right side-swept 4-1 exhaust now employs a dual-pass internal structure (rather than triple-pass) in the muffler, reducing back pressure. It also features a larger final exit aperture.
With shorter gear ratios from second through to fifth, the new CBR650F gets away from the line faster than the previous model and from a 60km/h second gear roll-on will pull out 3 bike lengths over 400m.
Slightly increased peak torque of 64Nm arrives at 8,000rpm, and the engine’s tractability allows it to pull smoothly from idle at 1,500 in sixth gear. Adding an extra layer of aural satisfaction, a throaty induction growl at low-to-mid rpm swaps over to an addictive high-rpm howl reminding the CBR650F rider of Honda’s four-cylinder racing pedigree.
The 649cc engine uses a compact internal architecture, stacked six-speed gearbox and starter/clutch layout with the cylinders canted forward 30°. The DOHC 16-valve cylinder head employs direct cam actuation; bore and stroke is set at 67mm x 46mm with compression ratio of 11.4:1.
Asymmetric piston skirts minimise bore contact and reduce friction. Ferrous spines on the outer surface of the cylinder sleeves reduce oil consumption (and friction) with improved heat transfer and a silent SV cam chain reduces frictional losses by using a Vanadium coating on its pins. Internal water channeling from cylinder head to cylinders does away with most of the exterior hoses.
Fuel consumption of 21km/l (WMTC mode) gives a range of over 350km from the 17.3L fuel tank. The CBR650F engine is EURO 4 compliant.