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Message: <blockquote data-quote="CDA" data-source="post: 34999" data-attributes="member: 103">If you tear the bike down and the piston looks to be in good shape, then there is no reason to replace the it, just ring it.  Use the money on something else.  Short story; When I was racing off-road on 250 2 strokes, I would take the jug off 4 times a year, every 3 months.  Full top-end to start the year, then 3 months for rings only, 6 month mark, full top end, next 3 months rings only and so on.  This was on a bike that was getting 30+ races a year at 60+ miles with each event.   Take the jug off and inspect the walls as well as the piston.  If this is the first time you are doing this, then yes it is probably a good idea to make everything fresh so you know.</blockquote>