Xr500 1979 air filter

I am looking for a better quality aftermarket air filter for my old thumper. Have trouble finding one. Or maybe modifing my air box. Thank you for your help in advance.

Have you tried K&N? They have the '81 filter. If that doesn't work, look at the year models close to it and see if you can find anything that will suit.

use the foam air filters

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