So my yz has been down for a little bit because of this chipping in the cylinder. Its only on the top but the rest of the cylinder looks good. Obviously its time for a new piston too. I don't understand how the big bore kit that is in it (maxpowerrpms 285) is so loved, especially since when i called them about getting it repaired they guessed that it was chipped right there before i even told them. The amount of material they leave until it hits the o-ring is scary. Anyways, was hoping you guys could think of a better option to get the chips welded up for cheaper than the over $300 that maxpowerrpms wants, before even buying a new piston for it. Let me know what you guys think!