The K&N BM-1204 is a washable, reusable panel-style engine air filter for BMW R1200 and R nineT motorcycles. It uses layered cotton gauze media in a drop-in format meant to fit the factory airbox without cutting or modification. The manufacturer lists the filter at 5.875 in long, 3.5 in wide, and 1.25 in tall, and includes a 1 oz tube of K&N sealing grease in the box. It is marketed as a high-flow upgrade over the stock paper element, and the manufacturer says it can be cleaned and reused rather than replaced.
Choose this filter over a disposable OEM replacement if you want a lasting, reusable intake element for a BMW R1200 or R nineT. The manufacturer states it is emissions-legal in all 50 states and will not void the vehicle warranty. It only needs cleaning about every 50,000 miles under normal highway riding. Track and canyon riders searching for a K&N BMW R1200 performance air filter, reusable BMW motorcycle intake, or R nineT high-flow air filter will find this is a direct-fit, no-modification option. Horsepower gains are not quantified here, so treat the performance claims as the manufacturer's design intent.
The manufacturer lists fitment for the BMW R1200 from 2004 to 2015 and the R nineT from 2014 to 2019. Other sellers list different year ranges, so confirm your model year against the manufacturer's fitment information before ordering.
The manufacturer states that the filter will not void the vehicle warranty and is emissions legal in all 50 states.
The manufacturer says it only needs cleaning about every 50,000 miles under normal highway driving conditions. Harsher dust or off-road use will shorten that interval.
According to the manufacturer, the package includes one air filter and one 1 oz tube of K&N sealing grease, which is used to seal the filter against the airbox.
Installation is a drop-in job with no cutting, but access on the R1200 family is the main obstacle. Owners on user forums report that on R1200S and RT models the right-side tank cover or fairing trim must come off first, then the intake snorkel is released by depressing two clips at the airbox and pulling it free. Per the manufacturer's general install hints for BMW tray-style airboxes, hold the filter in place with your fingers while sliding it into the housing so it does not drop out. If the lid is hard to close, lubricate the back of the tray with the included sealing grease. K&N clips need slightly more pressure than a stock foam seal, so if the lid is bending or the clips will not seat, stop and realign the lid rather than forcing it, because a cracked airbox is the most common costly mistake.
