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Message: [QUOTE="oldguy, post: 1128309, member: 16965"] after a while the rings wear and need to be replaced. Normally while you are in there you might as well replace the piston and gaskets- this is a basic 'topend' job. As part of the reassembly you should also check the powervalve to make sure it is clean and working freely. Usually on a 2 stroke that is raced by a typical B or C level rider it is a good idea to do a topend at least once a season often twice. [/QUOTE]