Hey all I'm 15 and a half and about 6'1'' and weighing in at about 120-130 pounds (i'm preety damn skinny). I am planning on taking the msf course, but I can't decide to get either the 250 or 500 kawasaki ninja. Is a 500 too much for me to handle? I have a little tiny bit of experience riding 125 dirtbikes that use a clutch but not that much. I'm very cautious against riding fast because I gota concussion riding my bike not too long ago (I would have died if I hadn't of had a helmet on). I want to get a motorcycle that will last but wont be so fast that if I slip up I would be hitting 80mph! Is this what a 500 is? Or is it too fast for me to learn on and should I just get a 250? Keep in mind I'm a total noobie at street bikes.