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Old February 23rd, 2009, 11:22 AM   #31
kkim
 
Join Date: Nov 2008

Posts: Too much.
I've not cleaned mine since installation. My experience w/ K&N filters have said to clean them when they look dirty or start to get caked. Mine still looks relatively clean on the majority of the filter. It would all depend on how dirty/dusty conditions are in your area and how often you ride.
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