I just finished tearing apart the FREE motor I got...I was thinking about just running it..( You know..OH ITS FINE..just run it kinda guys gave it to me..) but with my luck I wanted to see what was inside..GLAD I did..found 3 pistons that had broken rings and a few bearings with copper showing.Now with it all part I was wondering..would you re-use the head bolts,main bolts and such or replace them..?