Sure can that second one is me on holiday in japan on a vfr 400 SIKE!
Auto cross for bikes only in japan, You wanna learn real skills that translate to your bike buy a XR100 and build A small circle track in a feild the smaller the better and see how long you can ride in one gear and how fast you can get around it , then see if you can do it with out ever putting your foot down! I off season train on a XR100 ! Then if you really wanna get nuts do what we did take the front brake cable off! ride like that , then put a street tire on the front , ride like that, then put the dirt tire back on then put a street on the rear ride like that , then leave front brake off put street tires front and back that will really teach ya throttle control and good sliding technics!