The part to worry about is how easy the otk karts bend because they are so soft. Also, it Seems every used kart that is see in person has marks on either one or both sides where the bolt for the tie rod end hit the frame from a tie did end breaking. It’s not uncommon for a kart to bend 5mm from simply wheel hopping another kart. Unless the kart was put on a table and atraightened the odds of buying a used kart that is bent is much higher than 50% imo. On the bright side I have worked with numerous drivers that have had bent karts straightened and not noticed any drop on performance.