ok, i keep having oil shooting through through the air filter box through the brass fitting which is the crank breather, I have changed the oil over and over and have underfilled the oil and it still did it. I have cleaned the oil filter, cleaned the filter in the rear of the quad where the hose make a 90 degree angle and the the filter inside the engine on the bottom right side. I have tore the engine completely down and checked the piston and rings to see if it had "blow by" but the rings and piston are perfect. If anybody else has any more ideas on what i can do or check please let me know.

 

The main cause of oil in the airbox is overfilling. 1.5 quarts is the correct amount. Do you have the oil line update? If it still pumps it out then you need to check the scavange pump and the gears that drive it.