Grand Prix 500
Main Motorcycle: 2007 Tiger
Join Date: Aug 2012
Location: Eugene, Orygun
Other Motorcycle: Yamaha 250 MX gone, sadly
Most of my experience and my "Religious Zeal" come from my years of experience running dirt bikes in the Southern California desert. Talc dust and micro fine sand for three days in the 80 degree winter desert running WOT at red-line and we never cleaned a filter on the weekend rides. We ran oiled "green weenies" which were filter grade foam in the shape of a tube/weenie that was stretched over the carb opening. Dust would cake on the weenie and fall away maybe three times in the span of a weekend outing. We tore down our two stroke engines every winter to replace the rings and no one I know ever ever saw any bore scoring from dirt that got past the weenie.
Oiled foam is the best solid filter known to man. Filter oil that is really sticky, now.