What do you guys use to treat your foam pre filters with?
Reg ole WD40 on the Foamies...
Never had a problem with Bel-Ray, neither did a friend of mine who raced BajaI use PJ1 and always have, it can be found at any motorcycle or atv shop, and those shops also carry several other good brands of filter oil as well. K&N is hard to beat also. You want something that has been around awhile and trusted by many racers, proven to work. I never see dirt inside my carb or engine using the PJ1 though, but i did when i used the Bel Ray stuff.