I just bought a 2002 cr125 and I was planning on rebuilding it at the end of this season but I'm thinking that I should do it earlier. It has 145 psi compression and it was last rebuilt in 2014 by the previous owner. The bottom and top end was done along with a new cylinder. Apparently it wasn't run much but I don't know. I just took the pipe off today to look at the piston and it looked good but there was a weird scuff pattern on it. It wasn't scratched or scored, just shiny. The cylinder looked really good and I could clearly see the cross hatching. Should I replace this piston now or does it still have life left? What could have caused the scuffing? Is it bad?