clipped from: www.r1150r.org   

Replace plastic fuel line quick disconnects with chrome plated brass ASAP ($72 from beemer boneyard). (OEM break at inopportune time and leave you stranded)
Replace brake and clutch fluid religiously at least biennially.
Once you break 30-40k miles time to check out clutch splines, clutch slave cylinder, FD bearings.
Mine was built in feb 2001 and its never had any issues (21k on it to date)

order these:
http://www.beemerboneyard.com/cpcqkdiscon.html

Drain fuel tank.

Remove a black plastic panel covering the fuel line quick disconnects (just above right throttle body)

cut 4 clamps holding the fuel line to the quick disconnects (dremel cutoff wheel works good here), be ready to catch fuel

install new QDs and clamps. be careful not to break the plastic fuel injection rails trying to monkey the QDs off/on, this is an expensive mistake.