just reclean filter & let the filter dry completly before you oil it ..
most bikes run no filter for the increased air flow. some bike are tuned that way 2 .
how i do it is i soap the filter with the kn filtercleaner, then i let it soak for 15 mins. get a BUCKET OF HOT WATER. dunk the filter in the bucket of water a few times, the water will be black , change the water and do it a few more times.
in some cases you might need to resoap the filter again and repeat.
alow filter to air dry , never blow compressed air through it. (will damage element).