I have used this seal on my CRF250 for several years and have been very happy with it. I have never found anything inside my airbox and don't have to deal with messy grease on the sealing lip of the air filter anymore. I recently bought this for my 2001 CR125 while rebuilding it and repairing the airbox.
I too am using on my 2007 CRF250R with my K & N filter. This seal works well with the K & N, no more with messing with the grease to seal filter. Air boot is clean every time I check at cleaning.
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