Here's a question for the experts...I removed my stock piston and cylinder from my moped. It has 750 miles on it and runs fine. I upgraded to 70cc...anyway...when I was looking at my old piston, I noticed these deep scratches on on side of the piston. The cylinder wall is fine and the piston rings don't have a mark on them. The engine ran just fine. Is this normal or was there a severe problem? The scratches look worse in the photo than they really are, but they are there. There are several "tiny" scratches towards the top (bottom of photo) and one really deep one by the pin.
