well right now im interested in getting a 2 stroke 250cc dirtbike. im pretty knew to dirtbikes as im pretty firmiliar with cars. dont know whats good or bad. so i have 1500 to spend on a used bike and ive come across kx's,rm's, cr's,and yz's i dont know any pros and cons? can some one help me out here in choosing the best bike for me? im 5'11 and weigh 240lbs.i just need something thatll keep up with my friends atv's. the type of riding ill be doing is mostly trails and track now and then. any info or help would be greatly appreciated!