Is the spray filter treatment is not sufficient? (Got PJ1 spray filter cleaner and treatment) WSM reads: Assembly Grease the edge (C) of the filter face that goes into the housing to ensure proper sealing.
Grease the under filter edges which helps to keep the filter against the airbox and potentially seal any voids. The 310 filter takes some squeezing to get it into position so at times I'll grease the plastic/screen that sits in the airbox instead of the filter itself and then with filter in place run fingers around the edge making sure all is seated well. I make sure to get some grease into the two slots in the plastic too that allow you to remove the screen.
