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198 Posts
I needed to change the (original O-ring) chain on my 2005 250 at 12K miles also, and didn't think that was bad. I had cleaned and lubed my chain around every 1K miles. I suspect that if the chain needs adjustment then it would wear more quickly. Also, If the bike is ridden or stored in wet or dirty conditions, it would need more frequent cleaning and lubrication (even O-ring or X-ring chains). I wish I would have changed the sprockets when I changed the chain, but they were little worn.