Originally Posted by ratboyab
1. - Do these bikes burn oil like mine does?
2. - Are they as bad at low as mine was (to the point were if you have it in 1st and allow the tick-over to drive you along the bike kangaroo's
3. - Between 2 & 4k rpm if you lightly come off the throttle the bike judders you forwards and slightly kangaroos when you go back on the throttle, is this normal?
4. - Any ideas where the increased noise is coming from and why it is suddenly popping and banging?
- Should I be burning the thing to the ground?
1. My 2007 K1200GT does not burn oil. I do not know whether other K1200GTs burn oil, but I do not add oil between changes, and it seems okay.
2. Do a web searches with different combinations of "Bucking Bronco Syndrome", "BBS", and "K1200GT". You should find a lot of information on it. The 2006-2008 K1200GTs always had some uneven throttling at lower RPMs, but the early models were worse. BMW fixed the issue by replacing the airbox with a different design. After that, things were improved but not perfect. Another thing that helped was updating the firmware on the bike. Yours may not have had the airbox fix or the latest firmware update. There were also homebrew fixes that people tried. Do the web searches and you will learn more.
If your airbox is the original type, the dealer will not replace it now - it was not a recall.
My new 2007 K1200GT had very strong engine braking when I rolled off the throttle. A few people liked it, but I did not. The throttle has always been "touchy" or "sensitive" for me, but this made it even more challenging when I rode. One of the firmware updates reduced engine braking considerably, making my ride smoother and easier for control and for coasting with the throttle rolled off. (I guess I am a "klutz" when it comes to sensitive throttles.)
I also have a PowerFRK installed. It fakes the system into thinking that the temperature sensor is reading a low temperature and is supposed to smooth out throttle at low RPMs. It does not seem to do much for me. I do NOT recommend it. I bet that they charge a high price for a few resistors, capacitors, etc.
The Power Commander is much more sophisticated and programmable, but I have not tried it.
3. See above.
4. If it is a very loud rattling noise, then it is may be a loose cam chain but that is just a guess. It is a very common problem. There are two issues:
a. If the cam chain jumps a tooth, then VERY bad things happen with the valves, pistons, etc. There is a BMW recall to add a small plastic chain jump guard to help prevent it from happening.
b. The noise probably comes from a loose cam chain tensioner. The original BMW cam chain tensioner was flat on top. The new cam chain tensioner has an (estimated) 1.5 or 2 cm high reservoir on top that fills with oil to push the piston down onto the top of the cam chain. The BMW dealer replaced my flat cam chain tensioner with the new one under warranty many years ago.
Still the reservoir-type cam chain tensioners can get stuck and not apply the proper tension on the cam chain, which is the source of the loud rattle. A few months ago, my bike started making a VERY loud rattle. I thought that maybe the cam chain had skipped a tooth. It was the cam chain. A very knowledgeable friend came by and brought an APE Race Parts manual cam chain tensioner to replace the BMW tensioner. You manually screw it down onto the cam chain, where it applies the proper tension. It requires periodic manual adjustment - you cannot neglect it - but it works much better than the oil reservoir type.
* I cannot be certain that your loud rattle is the cam chain tensioner, but it is a common problem that fits your description.
* If your cam chain tensioner is not working well, and your K1200GT does not have the cam chain jump guard, then there is an increased risk that your cam chain might jump a tooth, which is very bad. Even with the jump guard in place, there is a risk.
* Bring your bike to the BMW dealer to check for recalls. They will install the cam chain jump guard if it has not been done yet. There are other recalls as well, including the very recent issue about the cracking wheel flange. They won't replace the airbox or update your firmware unless it is part of a recall.