I have a 2008 650 that I just recently acquired. On startup there is no smoke but when your riding and you throttle it it will blow a puff of white smoke. Also when in neutral it will blow a small amount. The guy I got it from had a big bore kit and 11:1 compression piston installed. What could this be. No real loss of power.
From your description, I'd guess slight wear on the rings. No more than it's smoking I wouldn't worry about it and ride till it gets a bit more constant. Not going to hurt anything your not going to have to rework to fix anyway.
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