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K&N BM-1204 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   25 Customer Reviews
  • Designed to boost horsepower and rate of acceleration
  • Can be cleaned and used again
  • High air flow with exceptional filtration
  • Lasts up to 50,000 miles before cleaning is required depending on driving conditions
  • Works with original equipment manufacturer vehicle electronics
  • Emissions legal in all 50 US states
  • Will NOT void vehicle warranty
  • Million Mile Limited Warranty®
The K&N BM-1204 Air Filter fits some BMW HP2 Enduro, BMW HP2 Megamoto, BMW R nine T, BMW R nine T Pure, BMW R nine T Racer, BMW R nine T Scrambler, BMW R nine T Urban GS, BMW R1200GS, BMW R1200GS Adventure, BMW R1200GS HP2, BMW R1200R, BMW R1200R Classic, BMW R1200RS, BMW R1200RT, BMW R1200S, BMW R1200ST, and BMW R900RT models. See vehicle applications link for details.
K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for the majority of vehicles on the road. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. With most vehicles you simply remove the disposable air filter and replace it with a K&N. See applicable instruction sheet for details. Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty and will be the last air filter your vehicle will ever need.

[More Information on K&N Replacement Air Filters]

Product Specifications

Air Filter ShapePanel
Filter MaterialCotton Gauze
Height1.25 in (32 mm)
Outside Length5.875 in (149 mm)
Outside Width3.5 in (89 mm)
Package Contents1 Air Filter, 1 K&N 1oz Sealing Grease
Package Quantity1
Warranty1,000,000 Miles/10 Year
Product StylePanel Air Filter
Weight1.6 lb (0.7 kg)
Filter Re-Oiling Amount0.32 oz (9 ml)
Product Box Height7.25 in (184 mm)
Product Box Length4.63 in (117 mm)
Product Box Width4.63 in (117 mm)

K&N BM-1204 Air Filter Product Reviews

Tuesday, May 8, 2018 - Part BM-1204
Quality air-filter, easy, direct replacement no-worries.

Andrew Cowburn
Fenstanton, United Kingdom
Tuesday, February 27, 2018 - Part BM-1204
Love these filters have them on all our motorcycles plus we use the oil filters - they are so much less expensive than OEM filters. And on the dual sports the air filters are great - rinse wash oil replace they pay for themselves in no time.

Peggy Zaring
LaCrosse, Washington
Thursday, February 15, 2018 - Part BM-1204
I had one of these air filters in my BMW 1200 GSA ever since I bought the bike second hand on 37000 km. The filter had been fitted at the 10000km service by the previous owner. My bike is currently on 69000 km and is an 09. So I guess the filter was fitted in 2010 which makes it 8 years old. Unfortunately the rubber on the side walls collapsed and the filter had to be replaced and it was a no brainer for me to buy another K&N Filter as we do a lot of off road dirt riding in SA. The beauty of this filter is that you can wask it, reoil it and she is as good as a new one at a fraction of the cost after the initial outlay. This filter is about 3 times the cost of a normal paper type filter which would only survive about 6 months or maybe push to a year with the amount of dust riding done. Our bikes are service annnually so filters replaced (in this case cleaned) one or even twice per year depending on the amount of riding done. So for one of these to carry me through 8 services I'm guessing it's a great buy. If it was not for the rubber ridge collapse my filter would still be perfect. Thus the purchase of the new one and I threw in an oil filter for my next service as well. Thank you for the speedy service. $ days from America to SA and then 5 days to clear through customs and delivered to my front door. Was a pleasure doing business with you and I'm sure a few of the guys I ride with will be doing the same.

Rod Harris
East London, South Africa