I bought my son a 2000 xr70 from christmas, while cleaning it up for him I noticed the sub frame that supports the seat and rear fender had been broken and welded back together at some point. The welds seem to be very poor quality. I'm looking for advice, should I replace the frame, get it rewelded, or roll as is. The frame does seem to be sturdy despite the ghetto welding job. I saw a 2004 xr70 frame on ebay, I know I'll have to upgrade the seat and tank, and plastics if I go this route, but will everything else bolt up?