If you do alot of wheelies it will come out of the crankcase vent tube and go into the airbox, or whereever the hell the vent tube goes?? Right into the intake maybe??... I can't remember for sure..3 of my friends have 09 Brute 750's and they all do this if you ride alot of wheelies.
07' Raptor 700 SE- HMF Full System, Pro-Design Intake, HMF Optimizer, Stage 2 Hotcam, +3 TB, Dynatec Programmable w/dl700 custom curves, NGK Iridium, 15/38 gearing, speed sensor mod, GYTR Front Bumper, PRM Grab Bar, Pro Armor Nerfs, Pro Armor Chassis Skid, DG SS Rear Skid, Acerbis Handguards, Tusk P-Brake Block-Off, Renthal/DID, RazrII's, CST Ambush, HiPer CF1A's