Yesterday my bike started running really bad, spitting and sputering when just driving in gear with a steady throttle. It idles fine and when you get on the gas isnt too bad. I brought it home and looked at the air filter and it was really dirty. Way too dirty. then i took it off and went for a quick spin out the road and it still bucked and ran poor. then i figured id check the fluids to make sure everything is good and when i did there was no oil on the dipstick about 2 minutes after the bike was running. Coolant was good, checked the clearences on the valves and the intake are a tiny bit tight but exhaust is fine. Seems to have good compression and no noticeable change in power. Would it burn this much oil if it has good compression and valves are ok? the bike is white and lately i have noticed some brown on the right side of the fender, just past the end of the muffler which i am assuming is exhaust fumes. Would the bike act up like this if it has ran short of oil?