Bars mounted above the top triple-clamp allow a more upright riding position compared to the '03 Yamaha YZF-R6 that donated the basic heart and bones. Elsewhere, you'll find an assemblage of fourth and fifth-generation R6 bits, led by a 43mm fork from the '03 edition. Softer spring and damping rates serve up a more humane ride on public pavement. R6-spec chassis numbers mean handling is far quicker than any other second-string 600, with more encouraging front-end feedback. At 419 pounds full of gas, it's 22 lbs. lighter than Honda's CBR600F4i and 72 lbs. lighter than Yamaha's venerable steel-framed YZF600R. Cam timing and EFI mapping lay out a broader, more usable spread of power that's much easier to use on the street, but the 104-horse herd that arrives at 13,000 rpm is still good for high 10-second quarter-miles at 127 mph.