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K&N BM-0400 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.9 out of 5 stars   7 Customer Reviews
  • 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 ShapeRound
Filter MaterialCotton Gauze
Filter Re-Oiling Amount0.52 oz (15 ml)
Height3.375 in (86 mm)
Inner WireNo
Inside Diameter3 in (76 mm)
Outside Diameter4.375 in (111 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height4.25 in (108 mm)
Product Box Length4.63 in (117 mm)
Product Box Width4.63 in (117 mm)
Product StyleRound Air Filter
Top Material/FinishNone
Top StyleOpen
Weight0.6 lb (0.3 kg)

K&N BM-0400 Air Filter Product Reviews

Monday, April 18, 2016 - Part BM-0400
The K&N website is very easy to navigate. I have K&N filters in every motor I can. I feel the filters not only enhance the performance; the filters are also a good environmental product. I am not disposing of used filters. I have a 1998 BMW R1100 RT with over 130,000 miles and a 2004 Toyota Camry with over 230,000 miles that have K&N filters in them. Everytime I buy a different motorcycle or car; a K&N filter is installed if a K&N filter is available. I was glad to see you now offer cabin filters.

Dean Kohlmeyer
Garner, Iowa
Sunday, March 6, 2016 - Part BM-0400
I am using this filter for several years now. Bought second one that I can swap them just over. Clearly improved power output of engine. I wish the fabric layer would just dry a bit faster after a cleaning cycle.

Oxfordshire, United Kingdom
Tuesday, April 28, 2015 - Part BM-0400
Great product. Have used K&N filters in my other vehicles and have been very happy. The on-line purchase is easier than trying to find the correct product in a brick and mortar site.

Neal Morgan
La Verne, California
Monday, April 20, 2015 - Part BM-0400
The filter is superior over the stock one.

Lothar Andries
Roscommon, Michigan
Friday, October 31, 2014 - Part BM-0400
Quick, easy and convenient. Competitive/comparable pricing. Free shipping. Fast shipping.

Madison, Georgia
Monday, April 14, 2014 - Part BM-0400
I am fully satisfied with my K&N air filter. The combustion of the engine, I think, is much better. The exhaust sound is much rawer, so is the torque, much rawer, higher. I don't know if the consumption of gas will decrease ... because the fun of riding is so much increased. My bike asks now to have fun ... and that's what my wife and I are doing ... have fun.

André Lapiere
Kuurne, Belgium
Monday, November 18, 2013 - Part BM-0400
Good fit. Good performance. Good price. Delivery as requested. I have not used the recharge kit yet but will be giving feedback when I use the kit. I suspect it will be exactly as advertised.

Walt Farnlacher
San Leandro, California