I seem to be getting a little oil in my air filter, but the bike seems fine. What is my problem? is it something major? what do I do to keep oil from getting on the air filter? there is no oil leaking anywhere else, not on the engine or anywhere. I will clean the oil filter to try and save a little money and it has oil spots. after 2 to 3 cleanings, I replace it, to only find 2 weeks later more oil spots. please help.