z400 atv is blowing blue smoke after sitting all winter

Since november my quad had been sitting and last week when i started it up i noticed that it was spitting out blue smoke after i revved it, just on deacceleration. Its only a year old and ill be pissed if its the valves already. I heard though that this could be caused by either the fuel stabilizer i used or because of the fact that it sat upright for about 45 min. while i put on my new skid plates. I waas also told that it could be from having oil in the filter because the quad wasnt running right untill i cleaned off the filter ????i have no clue and Any help would be greatly appreciated, thanks ahead of time.

Blue smoke=burning oil. thats about all I know....

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