The engine is a clean-sheet design, engineered to be smaller and lighter while producing more power and fewer emissions. A more oversquare bore of 74.7 x 57.3mm (versus the old 73.4 x 59.0mm) boosts top-end performance, while reshaped combustion chambers (upping compression from 12.5:1 to 12.8:1) make room for larger valves (31mm intake, 25mm exhaust), actuated by revised cams for increased low- to mid-range power.
The transmission's input and output shafts have been shuffled, reducing engine length and allwing the crankcase to be simplified (now two pieses as opposed to three) and lightened.