This is the same type of bike I learned to ride. Same year even. 1973 Harley Davidson TX-125. Wish I still had it, it was rare when I owned one, rather now. Took me 3 years to rebuild due to problems getting parts. This one is listed @2500.00 I think.
the only real difference between a good tracker and a bad tracker, is observation. all the same data is present for both. The rest, is understanding what you're seeing.