Ok here are the symptoms driving me nuts with my '02 426; Every time I ride my jets get clogged, especially the pilot. I stop to pull off the catch bowl on the bottom of the carburetor and there's quite a bit of very fine dirt in there. I clean it out, blow through the pilot reassemble and go again....same thing. Now here's what I've tried so far not knowing if the dirt's coming from the tank or the airbox; Dumped out the tank, put in fresh gas (from another source) and added a fuel filter in-line between the tank and carburetor. Replaced the intake boot between the carb and engine and also the o-ring for the boot on the airbox side. Replaced the clamps for the boots on both sides. Got a new foam ring for the airfilter seal inside the airbox. And as always I service my airfilter properly after every ride. My understanding is that for the dirt to be in the bottom of the carb it must be coming in with the gas, right? Anything from the airbox would just blow through the top to the intake I would think. Need some advice bad!