2009 ltz 400
 

Need some help guys. I got a good looking 2009 ltz 400 for my son for Christmas. Looked the quad over really good. Engine sounded good with no signs of a knock or slap. Clutch good, all bearings good. I saw from my inspection front tires were shot and rear brake pads were needed as well as chain. Got it home ordered new front tires and ran to local dealer and got new handle bar grips, new chain, and a couple of oil filters. Here's were I encountered a problem. Oil overflowing with fuel. I know exactly were to look on a carburetor...... but with efi? Do I have a bad injector or what?
Thanks Matt