Hi guys: My new (to me) XR600 is blowing blue smoke on hard acceleration. It smoked a lot when started after a four-month sit in the previous owner's garage, but looked good afterwards. Too bad I didn't look behind me when test riding it. Oh well. Friends say it definitely puffs a cloud of blue smoke when whacking the throttle for a wheelie, and they're pretty sure there's no smoke after a sharp rolloff of the throttle. Does this sound like rings? Valves? Valve seats? Is there an easy way to tell? I found JAW's guide to replacing rings: http://jaw.iinet.net.au/crustyquinns/rering.html It doesn't seem too oppressive. Thoughts? Opinions? Thanks!