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K&N BU-1108

Replacement Filters > Replacement Air Filter
  • Designed to provide increased horsepower and torque
  • Pleated media provides a large filtration area offering long service intervals
  • Multiple layers of woven cotton gauze media offers excellent filtration
  • Application specific base seal and sealing bead
  • Made in the USA for over 40 years
  • Washable & reusable, pre-oiled and ready to ride!
  • Includes a 10-Year/Million-Mile Limited Warranty
K&N's high-flow air filters are available as a replacement for your stock motorcycle air filter element. They are custom engineered to fit your specific application and are designed to provide low restriction and increased performance, while providing excellent engine protection for your motorcycle.

[More Information on K&N Replacement Air Filters]

Product Specifications

Air Filter ShapePanel
Filter MaterialCotton Gauze
Filter Re-Oiling Amount0.67 oz (20 ml)
Height0.75 in (19 mm)
Outside Length11.625 in (295 mm)
Outside Width7.375 in (187 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height13.56 in (345 mm)
Product Box Length7.72 in (196 mm)
Product Box Width1.75 in (44 mm)
Product StylePanel Air Filter
Weight0.9 lb (0.4 kg)

Customer Feedback

I have not gotten my filter yet, but I wanted to acknowledge that K&N did a great job getting a product out for my motorcycle. I ride a '08 Buell 1125R. Lisa Watson and the whole K&N crew did an awesome job coordinating with some Buell 1125 owners to get this product developed and out on the street. I, as a customer who has purchased approximately 20 K&N filters, am glad that your company does not forget about the lower production number vehicles. I put K&N filters on all of my vehicles and although I have not gotten the one for my Bike yet, I know that it will perform up to, or beyond my expectations, just as every K&N filter I have ever purchased has performed. Thanks, again for making this filter for my Bike and for the awesome service to your customers.

Best Regards,

Mike Milian
Naval Science Professor
State University New York Maritime College

Dear K&N,

Recently, I purchased a new Kawasaki ZX-10R. As usual for any vehicle, I also purchased the suitable K&N filter. However, instead of immediately installing it, I left it on the shelf and more-or-less forgot about it.

Now, the bike has approximately 2900 miles on it and it is suffering from lower than expected power output and piston blowby. I attribute this to the paper air filter that came in the bike.

I believe the problem is, as the paper filter initially blocks the entry of dirt into the engine, the combination of vacuum acting on the filter, vibration from the motorcycle's engine and the lack of a chemical adhesive (filter oil) allow dirt particles to eventually pass through the filter.

At this time, I sent the bike to the dealer for compression testing to verify the reduced performance.

When I get the bike back, the first thing I'm going to do is to install the K&N filter.

BTW, my other motorcycle, a Buell 1125R, is running perfect after 5K miles as I installed a K&N filter immediately after purchasing it.

Brian Crawford
Spring, Texas
Awesome product.  My Buell is a different bike!

Mike Nofi
Rohnert Park, California