That bike looks to be in good shape with no issues. All Wiseco 2-stroke pistons I've seen have those holes, to reduce weight I suspect. The PV plate studs have been snapping for years. You need to heat the M5 nyloc nut with a heat gun or very carefully with a tourch before trying to remove it. Sometimes they snap anyway as some are way overtightened at the factory from my experience. They are cheap and I usualy buy a spare with a new bike anticipating this. If you look close at the plate/stud you will see why they break, the stud is turned down and spot welded to the back of plate. Its not so much an issue of the nyloc nut friction as the nut being too tight. If you get it off without snapping it, and just snug down a new nut, there are no problems as the part normally never breaks in operation.
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