Dyno charts from Two Brothers racing to compare stock vs slip on performance:
first lets look at the Ninja 650R
Here we see two things, a fairly steady climb on the hp, with only really a 10 foot pound torque gain through the entire powerband. So she’ll tug harder up to about 7k, then the torque drops off (notice the hp doesn’t, that is because hp is a factor of torque AND rpm). This means it will accelerate slower above 7k than it did below, but it will still have plenty of power to keep you moving. Also notice the scale, We are now talking about torque in excess of 35 pounds throughout the entire usable range. More than double that of the ninja 250.
Lastly, lets look that the ZX-636R
On the torque side of things, it climbs to a similar peak, from a similar low, but it is almost always above 40 pounds. The 650R only makes 40+ pounds for 3000 rpm, the 636 holds it for 7000.
Move over to the hp chart, and we see it is already making the 650R’s peak hp at just past half way through the rpm range. It climbs a similar slope, but keeps going to almost twice the power of the 650R.
But it isn’t just about power. Honestly, power is only a small part of what makes the bike hard to handle. “Handling” is a bigger issue. The ZX-6R turns in much sharper and faster than the 650R. Most cars take 2.5 turns of the steering wheel to reach full lock. So you have two and a half turns to accurately get the wheel where you want it. Supersports are like taking that making it only 1.5 turns, Suddenly every movement on the wheel has that much more of a magnified effect. You have to be smooth and subtle in your controls, over corrections are dangerous.
Then you add in the brakes. Just like the quick throttle can land you in trouble, so can powerful brakes. Go into a corner too fast, panic and grab your brakes to slow down, the bike will “high side”, that is, stand up and throw you off it.