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Feet are directly under you, instead of set to the rear.
There is virtually no way to use your thigh or knee to grip the tank while cornering like there is on a sport-bike.
The bars are far higher relative to your ass, you need to be (even more) conscious about dropping the shoulder.
Keeping weight off the bars while braking is a bigger challenge as there is less to brace against.
The saddle is so much narrower that you need to get way more than one cheek off. I think it is easier for a noob to be crossed up without realizing it.
It is much easier (and more important?) to transfer weight back and forth between the wheels.
For those of us less flexible types, the pegs scrape before the knee does. .. No matter how hard I try.
I just think a sportbike is an all around better choice for a dedicated track toy for a newer TD rider.
In my case, I'd rather pour money into track time for the SV than improving the KLX.