Hey Frog, I run two inline filters(one from each petcock). Dirt also enters the carb through the vent tubes and the carb inlet. This is why dirt bike guys are always keeping clean air filters(I have three air filters, two are always clean, the filter on the Berg is the easiest to change of any bike). I have a clean air filter every time I go riding. Also I clean the the carb at every other oil change(it is easy). If you do not have an air compressor, brake cleaner will make a good substitute, remove the carb from the bike, remove the float bowl, all the jets. Note your fuel screw and idle screw settings, then back them out all the way(or remove them). Blow the brake cleaner or compressed air through ALL the passages(don't forget to open the choke). Once you do this a few times, you will get quick at it and it should only take 15-20 min(One beer-two if you drink more than wrench). Remember...a clean bike always runs good...a dirty bike will always run like s@#t. JM2C :rant: