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Three major differences between the engines of both the machines are :
1. The Bore x Stroke ratio
2. The Compression ratio
3. Peak Power output
4. Peak Torque output
The Bore x Stroke Ratio
As can be very clearly seen that with a Bore x Stroke ratio of 76 x 55 mm (1.381:1) the Honda CBR 250R engine is slightly lower than that of the Kawasaki Ninja 250R at 62 x 41.2 mm (1.504:1), which means that the peak torque of the Honda CBR 250R would be coming at slightly lower rpms than the Kawasaki Ninja 250R. A quick look at the peak torque figures proves the point, as the CBR 250R develops it's peak torque at 8000 rpms and the Ninja 250R develops it's peak torque at 8200 rpms.
The Compression Ratio
The Kawasaki Ninja 250R with a compression ratio of 11.6:1, gains over the Honda CBR 250R which has a compression ratio 10.7:1. This means that the Ninja 250R has better thermal efficiency and is able to extract more mechanical energy from a given mass of air-fuel mixture. This translates into the fact that the Ninja 250R would be able to build speeds quicker than the CBR 250R.
Peak Power Output
Clearly, with it's Parallel Twin configuration and higher compression ratio, the Kawasaki Ninja 250R wins over the Honda CBR 250R by a handsome margin. But here we need to consider the fact that even though running on a single cylinder mill, the Honda is generating a very healthy power number, but the Ninja clearly zips ahead by numbers. Just imagine what fun it would have been to ride the Honda CBR 250RR, producing 40 HP at 14500 rpm, with Transverse four cylinder DOHC motor (with some contemporary styling of-course)!!
Peak Torque
Even though a single cylinder motor, the CBR 250R with 22.9 Nm Torque at 8000 rpm generates marginally more torque than the Ninja 250R with 22 Nm Torque at 8200 rpm. So, clearly the CBR is higher on torque than the Ninja with it's configuration.
So, apart from the engine, the most visible and prominent difference between the Kawasaki Ninja 250R and the Honda CBR 250R is the presence of optional C-ABS on the later. This, from my point of view is a great feature to have in any motorcycle and going by the reviews I've heard from people owning the Honda CBR 1000RR Fireblade with the C-ABS feature, this thing works like magic and is very confidence inspiring. So, price factor apart, anyone who decides to go for the Honda CBR 250R, must go for the C-ABS version of the bike, it's worth every extra penny shelled out.]
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