I have a old 88 kx 125.Was looking to up grade to a 98 kx125,the guy is the or.owner he has done the rings a few years ago but it,s never been bored or anything.It looks really clean but it sounds different than mine.It has a fmf gold muff. but the noise sounds like its in the tranny.it's like a rattling sound.might be just me.the bike looks brand new is asking $2000can$,How can i make sure its good to go.can a Mech. check pistons? :laugh: