I have been riding dirtbikes off and on for about 6 years, not a whole lot but enough to where im comfortable on them. I've been to parks and can go around the courses at a decent speed on everything from a 80cc to a 250cc 2 stroke...With this dirtbike experience would i be ok starting on a 600cc street bike? Should i start on the 250 ninja to get used to things? Any opinions would be appreciated 
thanks
thanks