I have attached a before and after for my Honda SL125 1972
I pick the bike up from a Honda dealer that took it as a part ex on a new bike, had been sitting in the back shed for 30 years and was rusty but not too bad. It was used as a farm bike but the basic mechanicals were sound. Long story short, a wanted to make an off road vintage bike for using in the dirt. Stripped the bike back to basics and powder coated the frame, 3mm over size piston and re-profiled cam. Exhaust is a straight through with megaphone so a bit loud. The result turned out well and very happy. I also have an SL!25 restored to original and building a XL250 Motosport but not yet finished.