Join Date: Jul 2007
Location: Anaheim, CA, USA
I am not sure I can help much, but I want you to know that your post was noticed.
I don't know much about the 2004 K1200GT. It is the last of a popular line of motorcycles with the "flying brick" engines. It has the longitudinally mounted inline four engine.
The 2006 K1200GT is completely different. It has the transverse mounted inline four engine. The 2006 K1200GT is the first of its model line, and has a variety of known issues. It has the early seat pattern (which is less desirable for riders and their passengers). It has the servo ABS brakes. Other parts are not available - BMW replacement shocks are not available, but there are alternatives. It is a fun bike to ride.
I have a late 2007 model K1200GT, a similar bike that has several improvements over the 2006 model, but lots of issues, too.