[KR500]

I own a Perfect Circle Nurlizer machine. I collected it as strictly a conversation piece and in case some pistons for which there not have been a reasonably priced replacement. Nurlizing was even suggested for new pistons as it tightened up the clearance and provided a place for lubricating oil to slide in the bores. As for all the good advice these previous gentleman have given, they are right on the money. Don't judge or predict what the real problem may be. Loose wrist pins, bent rods, ill fitting pistons, worn rings. A set of new pistons with fitted wrist pins and new rings along with proper fitting in the cylinders, a rebore may be needed, and you will be money ahead.