I have a TE250 (300 Athena actually) with about 3000 trail and fire road miles. It hasnt been ridden at all in the past year and when i started it up this morning, it was blowing white smoke until a little warm. Did an oil change and discovered water in the oil...and radiator level was abnormally low. 
it got pretty hot the last time i rode it (a year ago), so i figure its not just a fluke...I've got a problem.
Question is what will need to be fixed?
It still runs quite strong (ran it around the neighborhood before changing the oil) with no evidence of being down on power.
Thanks for any input. I was going to sell the bike (not being ridden) so am a little bummed at having to since a ton of money into the engine.
Thanks.
Mark.

it got pretty hot the last time i rode it (a year ago), so i figure its not just a fluke...I've got a problem.
Question is what will need to be fixed?
It still runs quite strong (ran it around the neighborhood before changing the oil) with no evidence of being down on power.
Thanks for any input. I was going to sell the bike (not being ridden) so am a little bummed at having to since a ton of money into the engine.
Thanks.
Mark.