At 60.000km, I�m runnin� my third set of chain&sprockets, so that's an average of 20.000km. And this set is still good for more km's to come. And they are all OEM Yamaha sets, which is here in Holland DID(at least mine are!). All I do is clean it once a month and spray regularly(S100 white chain lube). The cush drive rubbers were replaced at the same intervals.
Greetz, Hans.
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