Exhaust & Exhaust Header Bolts
From the very beginning BMW had problems with the K series exhaust pipes. In the K1100 series this has translated into a particular desire of exhaust header bolts to loosen, and even fall out, and for the pipes to crack just upstream of the collector. Scattered reports of missing and sheared exhaust bolts can be directly attributed to incorrect torquing of these bolts. The cracks may or may not be attributed to loose bolts.
BMW recommends checking the torque of these bolts every Inspection level service (12,000 miles) but it may be prudent to advance that to every 6,000 miles.
The correct settings are <insert data>, and it certainly would not hurt to check that all of the bolts are tight each time the bellypan is removed.
If you have a loose bolt, tighten it immediately. Failure to do so can result in the bolt falling out (and occasionally destroying the threads on the way out necessitating a Helicoil) or being sheared by the header.
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