While the only figures we have belong to the R25 that does not stop us from speculating on what the eventual showdown between the R3 and Ninja 300 will look like. I think there are some simple inferences we take from others in the industry. CBR250 demonstrated to us a jump from 250 to 300 through a simple alteration of the stroke. Logically this is what we can expect from the R25.
First the specs, R25 vs Ninja 300.
R25: 4 stroke DOHC 4 Valve Parallel Twin
N300: 4 stroke DOHC 8 Valve Twin
R25: 35.5 bhp @ 12,000 RPM
N300: 39 bhp @ 11,000 RPM
R25: 16.3 ft-lbs @ 10,000 RPM
N300: 19.9 ft-lbs @ 10,000 RPM
R25: 366 lbs (166 kg)
N300: 379.2 lbs (172 kg)
Power to Weight
R25: 10.3 lbs/HP
N300: 9.7 lbs/HP
Now where this gets fun is considering the stroke increase R3 is sure to enjoy. With an 8 mm increase in stroke the CBR jumped from 26 bhp to 30 bhp, thats a 15% power increase. Now if we expect a similar 15% power increase from the R3's stroked motor we would find ourselves at 41 bhp, which would then give us a revised power to weight of 8.9 lbs/HP.
This bike cannot show up soon enough, because you just know Kawasaki is not going to take this violation lying down