hi,can you motorize it ?

Nice!

I have seen many similar types of uni-cycle with engines. There is one guy here in the U.S. that has one with a V-8 engine on it!

yes its possible . but do you really want to ? they are ok going slow . but if you get into a speed wobble , your toast . they arent manuverable enough to be safe in traffic . please please please don,t ever drive one of those in traffic , somebody will end up dead

watch this vid , the guy is lucky he didn,t end up with 4 broken limbs

YouTube - McLean V-8 Monowheel (Crash)

yes you can found these on the net awhile ago