Hi guys, This is my first time rebuilding my top end on my 2007 rm 250 since I bought it. It has also been years for me since i have rebuild a top end. Anyway, after inserting the new piston I noticed that the piston did not rock back and forth smoothly on the connecting rod. After taking the piston off to inspect I noticed that there are tiny grooves in the small end of the connecting rod where the bearing sits. Is this normal? My gut says no, but they are so subtle and perfectly uniform that I almost think they should be there. Please let me know if this is by design - apologize for the pics it's the best I can do. Thanks!!