Perhaps this would be a good time to introduce you to Pokie Parmidge. He's a Coloradan that has been building & repairing BMW Motorcycles since the 1970's. He has taken the time to meticulously catalog EVERYTHING you need to know about your R1200C on linked web pages. Here's the link to the page with the answer to your question about air filters: http://www.pokiespages.com/pokie/airfilter.htm. He suggests that you must remove the gas tank and there's a complete step by step for that too...
Replace cabin air filter BMW 318i 1995
Under the right side chrome air cleaner cover.
To check or change the battery on the BMW R1200C, you must remove the gas tank. I would suggest that if you are going to check the battery or replace it you might as well change the air filter as it is under the tank also. The following web site gives you instuctions for removing the tank as well as other ervice related issues. http://parmidge.com/POKIE/ Hope This helps Tank Specific http://parmidge.com/POKIE/tank.htm
There is no cabin air filter in a Z3.
Go to links below and download instruction. http://www.allergybegone.com/bmw-z4-cabin-air-filter.html
The BMW 740IL has a cabin air filter which helps to filter air. This is located inside of the cabin vents.
2008 BMW R1200RT to get to the air filter its all on the right hand side under all the Tupperware i can send pictures of mine torn down if you like e-mail me at SROBERTS@DGISUPPLY.COM
There is no air conditioner filter in a Z3.
You can use any air filter as long as it is designed for vehicle.
The cabin air filter on a 2000 BMW 323ci is located under the glove compartment. It filters air which enters and is circulated through the passenger compartment.
how do i change the air filter on my Audi a6
How do you change the air filter on 1995 SL500*