My ktm 450 exc 2005 burns oil and makes blue smoke and I have got oil in airbox but i dont know why it is burning oil. What could it be. Please help

This is usually because of a few things,,,check,,,, and maybe change your plug,,,check gap,,,,adjust your carb,... it sounds like it is way to rich,,,,,lean it out a little,,,,,,and the worse problem,,,,,your rings on the piston may be getting worn,,,,and allowing oil to seep by,,,thus,,going into your airbox,,,,,,and combustion chamber,,,,, then blue smoke,,,,, take a compression check if all else fails,,,,,,, this will tell you if your rings are bad,,,,,, JOEL