The AFE filters do not work. Great concept but unfortunately I don't think we will get away from oil! I was quite disappointed as I had ordered them at the same time Norcalride experienced his failure with the Filters. I destroyed the two I had received as AFE told me they were defective and they had to change them.
I received the new fitlers over a month after I destroyed the first ones. I figured they would have rectified the problem so I installed one on the ole yz450.
I smeared grease on the inside just to catch any little bit of silt that could possibly make it through. Well turns out I didn't even need the grease, there was actually fine silt pooled in the bottom of the intake and the grease was brown. The sad part is that I wasn't even riding in the most dusty of conditions and the filter still let the fine silt through. I even have a picture on the inside of the filter that shows the silt coming right through, there is a fine brown layer trailing right out of the filter. I can't post attachments yet but when I can I will put my photo's up.
Now the only question is ... how badly have I hurt my motor? How much does running some silt through a fourstoke affect its life, performance, etc...? The carb makes a scratching sound as I turn the throttle, as there is no doubt sand in it!!
I notified AFE of the problem Monday morning and have not heard back form them yet.
I will keep everyone posted!