Hey guys well borrowed my quad to my nephew he ended up riding in first gear for three blocks came to a stop shut machine off once I tried to turn it back on but it doesn't start since then there was oil coming out of hose that connects to air box did he blow my motor

 

I would pull your spark plug inspect it, test your compression should be around 125 or above. If he over revved the motor he may just have caused a shyt load of blowby oil there is only 1 way that I know of to be sure. When you change the plug which I think is what your going to have to do disconnect the oil breather tube for a couple minutes you may also have to clean your carb.

 

Got your message, the battery may be dead from cranking. OK charge your battery or jump it with battery cables or a jump box.
Check for spark btw with the plug out check compression. If you don't have a compression gauge you can put your finger over the plug hole and crank it over (note, NOT IN IT AND NOT TOUCHING THE PLUG WIRE) if there is enough compression to push hard against your finger your motor has a chance. If there is spark and compression then the problem is fuel. Good luck.