I youst installed my new uni filter on my 500s a för days ago. And now i notice the filter had slippt of, cleaned Borg the filter conection and the airbox conection from some grese (probably air filter oil) do you think that was the Claude of the filter slipping of? (Have cut of the original "lip" to get the unifilter on)

Probably oil from the filter.Clean both the adapter and the inside of the filter where it contacts the adapter with rubbing alcohol.This will remove the oil residue and not damage the plastic adapter or the rubber on the filter.Make sure both are dry when re-installing.

I cleaned Both the inside of the filter and the conection in the airbox with breakcleaner in a tag. seems like it gripped better now.