If speed is what you’re looking for in a bike, the Ninja 650 and ZX-4R, along with the ZX-4RR, might be on your radar, and they’re evenly matched when it comes to top speed in the U.S. The Ninja 650 boasts a 649cc engine, while the ZX-4R and ZX-4RR are equipped with the same 399cc power plant, but that doesn’t tell the whole story. The Ninja 650 is heavier, with a curb weight of 423.4 lbs (421.2 for a non-ABS
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