Have one bad piston.. cylinder wall is perfect.. je 700 piston 1cc dome.. I can not find a replacement anywhere.. je has a 502 replacement piston.. 4.47" unfortunately my piston measurement is 4.46".. short of je making a custom piston.. or buying 8 pistons and boring to a standard size.. which I would rather not do since there is absolutely no wear on the bores.. not sure what else to do..