I have noticed a thin layer of fine dust on the inside of the intake boot just past air filter. I can't figure out where this is coming from. I have checked everything, no holes or cracks in boot, clamps are tight and properly aligned. Air filter is new with proper oiling and lined up correctly. Only thing I have not checked is the big clamp inside the air box. It seems tight by hand but I can't figure out how to get to the bolt to actually check tightness. Any thoughts or ideas?